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Compress bitmap does not compress the height of the image [duplicate]

I want to capture image in low resolution using android camera api but when I captured image it will take default resolution of device camera.So I want to capture image in low resolution or small size at time of capture or how can I compress big image into small size in android?

You can create bitmap with captured image as below:
Bitmap bitmap = Bitmap.createScaledBitmap(capturedImage, width, height, true);
Here you can specify width and height of the bitmap that you want to set to your ImageView. The height and width you can set according to the screen dpi of the device also, by reading the screen dpi of different devices programmatically.

Use Compressor (Image compression library).
Visit zetbaitsu/Compressor for code and documentation.
add dependency in gradle (app level)
dependencies {
implementation 'id.zelory:compressor:3.0.0'
}
To Compress Image use one of these approaches:
Compress Image File:
val compressedImageFile = Compressor.compress(context, actualImageFile)
Compress Image File to Bitmap:
val compressedImageFile = Compressor.compress(context, actualImageFile)
val bitmap = BitmapFactory.decodeFile(compressedImageFile.path)

Try this is working great with me.
private String decodeFile(String path) {
String strMyImagePath = null;
Bitmap scaledBitmap = null;
try {
// Part 1: Decode image
Bitmap unscaledBitmap = ScalingUtilities.decodeFile(path, DESIREDWIDTH, DESIREDHEIGHT, ScalingLogic.FIT);
if (!(unscaledBitmap.getWidth() <= 800 && unscaledBitmap.getHeight() <= 800)) {
// Part 2: Scale image
scaledBitmap = ScalingUtilities.createScaledBitmap(unscaledBitmap, DESIREDWIDTH, DESIREDHEIGHT, ScalingLogic.FIT);
} else {
unscaledBitmap.recycle();
return path;
}
// Store to tmp file
String extr = Environment.getExternalStorageDirectory().toString();
File mFolder = new File(extr + "/myTmpDir");
if (!mFolder.exists()) {
mFolder.mkdir();
}
String s = "tmp.png";
File f = new File(mFolder.getAbsolutePath(), s);
strMyImagePath = f.getAbsolutePath();
FileOutputStream fos = null;
try {
fos = new FileOutputStream(f);
scaledBitmap.compress(Bitmap.CompressFormat.PNG, 70, fos);
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
scaledBitmap.recycle();
} catch (Throwable e) {
}
if (strMyImagePath == null) {
return path;
}
return strMyImagePath;
}
Utility Class
public class ScalingUtilities {
/**
* Utility function for decoding an image resource. The decoded bitmap will
* be optimized for further scaling to the requested destination dimensions
* and scaling logic.
*
* #param res The resources object containing the image data
* #param resId The resource id of the image data
* #param dstWidth Width of destination area
* #param dstHeight Height of destination area
* #param scalingLogic Logic to use to avoid image stretching
* #return Decoded bitmap
*/
public static Bitmap decodeResource(Resources res, int resId, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
Options options = new Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(res, resId, options);
options.inJustDecodeBounds = false;
options.inSampleSize = calculateSampleSize(options.outWidth, options.outHeight, dstWidth,
dstHeight, scalingLogic);
Bitmap unscaledBitmap = BitmapFactory.decodeResource(res, resId, options);
return unscaledBitmap;
}
public static Bitmap decodeFile(String path, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
Options options = new Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
options.inJustDecodeBounds = false;
options.inSampleSize = calculateSampleSize(options.outWidth, options.outHeight, dstWidth,
dstHeight, scalingLogic);
Bitmap unscaledBitmap = BitmapFactory.decodeFile(path, options);
return unscaledBitmap;
}
/**
* Utility function for creating a scaled version of an existing bitmap
*
* #param unscaledBitmap Bitmap to scale
* #param dstWidth Wanted width of destination bitmap
* #param dstHeight Wanted height of destination bitmap
* #param scalingLogic Logic to use to avoid image stretching
* #return New scaled bitmap object
*/
public static Bitmap createScaledBitmap(Bitmap unscaledBitmap, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
Rect srcRect = calculateSrcRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(),
dstWidth, dstHeight, scalingLogic);
Rect dstRect = calculateDstRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(),
dstWidth, dstHeight, scalingLogic);
Bitmap scaledBitmap = Bitmap.createBitmap(dstRect.width(), dstRect.height(),
Config.ARGB_8888);
Canvas canvas = new Canvas(scaledBitmap);
canvas.drawBitmap(unscaledBitmap, srcRect, dstRect, new Paint(Paint.FILTER_BITMAP_FLAG));
return scaledBitmap;
}
/**
* ScalingLogic defines how scaling should be carried out if source and
* destination image has different aspect ratio.
*
* CROP: Scales the image the minimum amount while making sure that at least
* one of the two dimensions fit inside the requested destination area.
* Parts of the source image will be cropped to realize this.
*
* FIT: Scales the image the minimum amount while making sure both
* dimensions fit inside the requested destination area. The resulting
* destination dimensions might be adjusted to a smaller size than
* requested.
*/
public static enum ScalingLogic {
CROP, FIT
}
/**
* Calculate optimal down-sampling factor given the dimensions of a source
* image, the dimensions of a destination area and a scaling logic.
*
* #param srcWidth Width of source image
* #param srcHeight Height of source image
* #param dstWidth Width of destination area
* #param dstHeight Height of destination area
* #param scalingLogic Logic to use to avoid image stretching
* #return Optimal down scaling sample size for decoding
*/
public static int calculateSampleSize(int srcWidth, int srcHeight, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
if (scalingLogic == ScalingLogic.FIT) {
final float srcAspect = (float)srcWidth / (float)srcHeight;
final float dstAspect = (float)dstWidth / (float)dstHeight;
if (srcAspect > dstAspect) {
return srcWidth / dstWidth;
} else {
return srcHeight / dstHeight;
}
} else {
final float srcAspect = (float)srcWidth / (float)srcHeight;
final float dstAspect = (float)dstWidth / (float)dstHeight;
if (srcAspect > dstAspect) {
return srcHeight / dstHeight;
} else {
return srcWidth / dstWidth;
}
}
}
/**
* Calculates source rectangle for scaling bitmap
*
* #param srcWidth Width of source image
* #param srcHeight Height of source image
* #param dstWidth Width of destination area
* #param dstHeight Height of destination area
* #param scalingLogic Logic to use to avoid image stretching
* #return Optimal source rectangle
*/
public static Rect calculateSrcRect(int srcWidth, int srcHeight, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
if (scalingLogic == ScalingLogic.CROP) {
final float srcAspect = (float)srcWidth / (float)srcHeight;
final float dstAspect = (float)dstWidth / (float)dstHeight;
if (srcAspect > dstAspect) {
final int srcRectWidth = (int)(srcHeight * dstAspect);
final int srcRectLeft = (srcWidth - srcRectWidth) / 2;
return new Rect(srcRectLeft, 0, srcRectLeft + srcRectWidth, srcHeight);
} else {
final int srcRectHeight = (int)(srcWidth / dstAspect);
final int scrRectTop = (int)(srcHeight - srcRectHeight) / 2;
return new Rect(0, scrRectTop, srcWidth, scrRectTop + srcRectHeight);
}
} else {
return new Rect(0, 0, srcWidth, srcHeight);
}
}
/**
* Calculates destination rectangle for scaling bitmap
*
* #param srcWidth Width of source image
* #param srcHeight Height of source image
* #param dstWidth Width of destination area
* #param dstHeight Height of destination area
* #param scalingLogic Logic to use to avoid image stretching
* #return Optimal destination rectangle
*/
public static Rect calculateDstRect(int srcWidth, int srcHeight, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
if (scalingLogic == ScalingLogic.FIT) {
final float srcAspect = (float)srcWidth / (float)srcHeight;
final float dstAspect = (float)dstWidth / (float)dstHeight;
if (srcAspect > dstAspect) {
return new Rect(0, 0, dstWidth, (int)(dstWidth / srcAspect));
} else {
return new Rect(0, 0, (int)(dstHeight * srcAspect), dstHeight);
}
} else {
return new Rect(0, 0, dstWidth, dstHeight);
}
}
}

You can compress image bitmap like this way.
ByteArrayOutputStream out = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
Here 100 is quality of image and you can change format of image to get low resolution image.

I think you are asking about Shrinking image size:
public Bitmap ShrinkBitmap(String file, int width, int height)
{
BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
bmpFactoryOptions.inJustDecodeBounds = true;
Bitmap bitmap = BitmapFactory.decodeFile(file, bmpFactoryOptions);
int heightRatio = (int) Math.ceil(bmpFactoryOptions.outHeight / (float) height);
int widthRatio = (int) Math.ceil(bmpFactoryOptions.outWidth / (float) width);
if(heightRatio > 1 || widthRatio > 1)
{
if(heightRatio > widthRatio)
{
bmpFactoryOptions.inSampleSize = heightRatio;
}
else
{
bmpFactoryOptions.inSampleSize = widthRatio;
}
}
bmpFactoryOptions.inJustDecodeBounds = false;
bitmap = BitmapFactory.decodeFile(file, bmpFactoryOptions);
return bitmap;
}

please have look at compressImage method i have used for compressing image.
public static String compressImage(String imageUri, Activity activity) {
String filename = "";
try {
String filePath = getRealPathFromURI(imageUri, activity);
Bitmap scaledBitmap = null;
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
int actualHeight = options.outHeight;
int actualWidth = options.outWidth;
float maxHeight = 816.0f;
float maxWidth = 612.0f;
float imgRatio = actualWidth / actualHeight;
float maxRatio = maxWidth / maxHeight;
if (actualHeight > maxHeight || actualWidth > maxWidth) {
if (imgRatio < maxRatio) {
imgRatio = maxHeight / actualHeight;
actualWidth = (int) (imgRatio * actualWidth);
actualHeight = (int) maxHeight;
} else if (imgRatio > maxRatio) {
imgRatio = maxWidth / actualWidth;
actualHeight = (int) (imgRatio * actualHeight);
actualWidth = (int) maxWidth;
} else {
actualHeight = (int) maxHeight;
actualWidth = (int) maxWidth;
}
}
options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight);
options.inJustDecodeBounds = false;
options.inDither = false;
options.inPurgeable = true;
options.inInputShareable = true;
options.inTempStorage = new byte[16 * 1024];
try {
bmp = BitmapFactory.decodeFile(filePath, options);
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
try {
scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.ARGB_8888);
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
float ratioX = actualWidth / (float) options.outWidth;
float ratioY = actualHeight / (float) options.outHeight;
float middleX = actualWidth / 2.0f;
float middleY = actualHeight / 2.0f;
Matrix scaleMatrix = new Matrix();
scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);
Canvas canvas;
if (scaledBitmap != null) {
canvas = new Canvas(scaledBitmap);
canvas.setMatrix(scaleMatrix);
canvas.drawBitmap(bmp, middleX - bmp.getWidth() / 2, middleY - bmp.getHeight() / 2, new Paint(Paint.FILTER_BITMAP_FLAG));
}
ExifInterface exif;
try {
exif = new ExifInterface(filePath);
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 0);
Matrix matrix = new Matrix();
if (orientation == 6) {
matrix.postRotate(90);
} else if (orientation == 3) {
matrix.postRotate(180);
} else if (orientation == 8) {
matrix.postRotate(270);
}
if (scaledBitmap != null) {
scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0, scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix, true);
}
} catch (IOException e) {
e.printStackTrace();
}
FileOutputStream out;
filename = getFilename(activity);
try {
out = new FileOutputStream(filename);
if (scaledBitmap != null) {
scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 80, out);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
return filename;
}
private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int heightRatio = Math.round((float) height / (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
final float totalPixels = width * height;
final float totalReqPixelsCap = reqWidth * reqHeight * 2;
while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
inSampleSize++;
}
return inSampleSize;
}
private static String getRealPathFromURI(String contentURI, Activity activity) {
Uri contentUri = Uri.parse(contentURI);
Cursor cursor = activity.getContentResolver().query(contentUri, null, null, null, null);
if (cursor == null) {
return contentUri.getPath();
} else {
cursor.moveToFirst();
int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
return cursor.getString(idx);
}
}

You can use this awesome library to compress.
Add dependency in app-level gradel:
dependencies {
implementation 'id.zelory:compressor:3.0.0'
}
And then just compress the actual image file like this:
val compressedImageFile = Compressor.compress(context, actualImageFile)

You should use Googles native image format WebP, it will shrink the image without losing quality. You can compress 80% of the picture without losing quality.
You can use CompressFormat.WEBP to encode any bitmap in WEBP format.
Example from file:
const int quality = 100;
FileOutputStream out = new FileOutputStream(path);
bitmap.compress(Bitmap.CompressFormat.WEBP, quality, out);
out.close();

Try this one:
byte[] data = null;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bi.compress(Bitmap.CompressFormat.JPEG, 100, baos);
data = baos.toByteArray();

i resolve this problem in this way, later i will improve the code
protected Void doInBackground(byte[]... data) {
FileOutputStream outStream = null;
// Write to Internal Storage
try {
File dir = new File (context.getFilesDir());
dir.mkdirs();
String fileName ="image.jpg";
File outFile = new File(dir, fileName);
outFile.setExecutable(true, false);
outFile.setWritable(true, false);
outStream = new FileOutputStream(outFile);
outStream.write(data[0]);
outStream.flush();
outStream.close();
InputStream in = new FileInputStream(context.getFilesDir()+"image.jpg");
Bitmap bm2 = BitmapFactory.decodeStream(in);
OutputStream stream = new FileOutputStream(String.valueOf(context.getFilesDir()+pathImage+"/"+idPicture+".jpg"));
bm2.compress(Bitmap.CompressFormat.JPEG, 50, stream);
stream.close();
in.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
return null;
}

use this class to compress image
import android.content.Context
import android.graphics.Bitmap
import android.graphics.BitmapFactory
import android.graphics.Canvas
import android.graphics.Matrix
import android.graphics.Paint
import android.net.Uri
import android.os.Environment
import java.io.*
class ImageFile(val uri: Uri, name: String) {
val filename: String
init {
val file = File(Environment.getExternalStorageDirectory().toString() + "/Documents")
if (!file.exists()) {
file.mkdirs()
}
val fileNoMedia = File(file.absolutePath + "/.nomedia")
if (!fileNoMedia.exists())
fileNoMedia.createNewFile()
if (name.toLowerCase().endsWith(".pdf")) {
filename = file.absolutePath + "/" + System.currentTimeMillis() + ".pdf"
} else {
filename = file.absolutePath + "/" + System.currentTimeMillis() + ".jpg"
}
}
#Throws(IOException::class)
fun copyFileStream(context: Context, uri: Uri): String {
if (filename.endsWith(".pdf") || filename.endsWith(".PDF")) {
var ins: InputStream? = null
var os: OutputStream? = null
try {
ins = context.getContentResolver().openInputStream(uri)
os = FileOutputStream(filename)
val buffer = ByteArray(1024)
var length: Int = ins.read(buffer)
while (length > 0) {
os.write(buffer, 0, length);
length = ins.read(buffer)
}
} catch (e: Exception) {
e.printStackTrace();
} finally {
ins?.close()
os?.close()
}
} else {
var ins: InputStream? = null
var os: OutputStream? = null
try {
ins = context.getContentResolver().openInputStream(uri)
var scaledBitmap: Bitmap? = null
val options = BitmapFactory.Options()
options.inJustDecodeBounds = true
var bmp = BitmapFactory.decodeStream(ins, null, options)
var actualHeight = options.outHeight
var actualWidth = options.outWidth
// max Height and width values of the compressed image is taken as 816x612
val maxHeight = 816.0f
val maxWidth = 612.0f
var imgRatio = (actualWidth / actualHeight).toFloat()
val maxRatio = maxWidth / maxHeight
// width and height values are set maintaining the aspect ratio of the image
if (actualHeight > maxHeight || actualWidth > maxWidth) {
if (imgRatio < maxRatio) {
imgRatio = maxHeight / actualHeight
actualWidth = (imgRatio * actualWidth).toInt()
actualHeight = maxHeight.toInt()
} else if (imgRatio > maxRatio) {
imgRatio = maxWidth / actualWidth
actualHeight = (imgRatio * actualHeight).toInt()
actualWidth = maxWidth.toInt()
} else {
actualHeight = maxHeight.toInt()
actualWidth = maxWidth.toInt()
}
}
// setting inSampleSize value allows to load a scaled down version of the original image
options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight)
// inJustDecodeBounds set to false to load the actual bitmap
options.inJustDecodeBounds = false
// this options allow android to claim the bitmap memory if it runs low on memory
options.inPurgeable = true
options.inInputShareable = true
options.inTempStorage = ByteArray(16 * 1024)
try {
// load the bitmap from its path
ins.close()
ins = context.getContentResolver().openInputStream(uri)
bmp = BitmapFactory.decodeStream(ins, null, options)
} catch (exception: OutOfMemoryError) {
exception.printStackTrace()
}
try {
scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.ARGB_8888)
} catch (exception: OutOfMemoryError) {
exception.printStackTrace()
}
val ratioX = actualWidth / options.outWidth.toFloat()
val ratioY = actualHeight / options.outHeight.toFloat()
val middleX = actualWidth / 2.0f
val middleY = actualHeight / 2.0f
val scaleMatrix = Matrix()
scaleMatrix.setScale(ratioX, ratioY, middleX, middleY)
val canvas = Canvas(scaledBitmap!!)
canvas.matrix = scaleMatrix
canvas.drawBitmap(bmp, middleX - bmp.width / 2, middleY - bmp.height / 2, Paint(Paint.FILTER_BITMAP_FLAG))
os = FileOutputStream(filename)
scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 80, os)
val buffer = ByteArray(1024)
var length: Int = ins.read(buffer)
while (length > 0) {
os.write(buffer, 0, length);
length = ins.read(buffer)
}
} catch (e: Exception) {
e.printStackTrace();
} finally {
ins?.close()
os?.close()
}
}
return filename
}
fun calculateInSampleSize(options: BitmapFactory.Options, reqWidth: Int, reqHeight: Int): Int {
val height = options.outHeight
val width = options.outWidth
var inSampleSize = 1
if (height > reqHeight || width > reqWidth) {
val heightRatio = Math.round(height.toFloat() / reqHeight.toFloat())
val widthRatio = Math.round(width.toFloat() / reqWidth.toFloat())
inSampleSize = if (heightRatio < widthRatio) heightRatio else widthRatio
}
val totalPixels = (width * height).toFloat()
val totalReqPixelsCap = (reqWidth * reqHeight * 2).toFloat()
while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
inSampleSize++
}
return inSampleSize
}
}
https://lalitjadav007.blogspot.in/2017/08/compress-image-in-android.html

You can try this code
public class ScalingUtilities {
/**
* Utility function for decoding an image resource. The decoded bitmap will
* be optimized for further scaling to the requested destination dimensions
* and scaling logic.
*
* #param res The resources object containing the image data
* #param resId The resource id of the image data
* #param dstWidth Width of destination area
* #param dstHeight Height of destination area
* #param scalingLogic Logic to use to avoid image stretching
* #return Decoded bitmap
*/
public static Bitmap decodeResource(Resources res, int resId, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
Options options = new Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(res, resId, options);
options.inJustDecodeBounds = false;
options.inSampleSize = calculateSampleSize(options.outWidth, options.outHeight, dstWidth,
dstHeight, scalingLogic);
Bitmap unscaledBitmap = BitmapFactory.decodeResource(res, resId, options);
return unscaledBitmap;
}
public static Bitmap decodeFile(String path, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
Options options = new Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
options.inJustDecodeBounds = false;
options.inSampleSize = calculateSampleSize(options.outWidth, options.outHeight, dstWidth,
dstHeight, scalingLogic);
Bitmap unscaledBitmap = BitmapFactory.decodeFile(path, options);
return unscaledBitmap;
}
/**
* Utility function for creating a scaled version of an existing bitmap
*
* #param unscaledBitmap Bitmap to scale
* #param dstWidth Wanted width of destination bitmap
* #param dstHeight Wanted height of destination bitmap
* #param scalingLogic Logic to use to avoid image stretching
* #return New scaled bitmap object
*/
public static Bitmap createScaledBitmap(Bitmap unscaledBitmap, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
Rect srcRect = calculateSrcRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(),
dstWidth, dstHeight, scalingLogic);
Rect dstRect = calculateDstRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(),
dstWidth, dstHeight, scalingLogic);
Bitmap scaledBitmap = Bitmap.createBitmap(dstRect.width(), dstRect.height(),
Config.ARGB_8888);
Canvas canvas = new Canvas(scaledBitmap);
canvas.drawBitmap(unscaledBitmap, srcRect, dstRect, new Paint(Paint.FILTER_BITMAP_FLAG));
return scaledBitmap;
}
/**
* ScalingLogic defines how scaling should be carried out if source and
* destination image has different aspect ratio.
*
* CROP: Scales the image the minimum amount while making sure that at least
* one of the two dimensions fit inside the requested destination area.
* Parts of the source image will be cropped to realize this.
*
* FIT: Scales the image the minimum amount while making sure both
* dimensions fit inside the requested destination area. The resulting
* destination dimensions might be adjusted to a smaller size than
* requested.
*/
public static enum ScalingLogic {
CROP, FIT
}
/**
* Calculate optimal down-sampling factor given the dimensions of a source
* image, the dimensions of a destination area and a scaling logic.
*
* #param srcWidth Width of source image
* #param srcHeight Height of source image
* #param dstWidth Width of destination area
* #param dstHeight Height of destination area
* #param scalingLogic Logic to use to avoid image stretching
* #return Optimal down scaling sample size for decoding
*/
public static int calculateSampleSize(int srcWidth, int srcHeight, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
if (scalingLogic == ScalingLogic.FIT) {
final float srcAspect = (float)srcWidth / (float)srcHeight;
final float dstAspect = (float)dstWidth / (float)dstHeight;
if (srcAspect > dstAspect) {
return srcWidth / dstWidth;
} else {
return srcHeight / dstHeight;
}
} else {
final float srcAspect = (float)srcWidth / (float)srcHeight;
final float dstAspect = (float)dstWidth / (float)dstHeight;
if (srcAspect > dstAspect) {
return srcHeight / dstHeight;
} else {
return srcWidth / dstWidth;
}
}
}
/**
* Calculates source rectangle for scaling bitmap
*
* #param srcWidth Width of source image
* #param srcHeight Height of source image
* #param dstWidth Width of destination area
* #param dstHeight Height of destination area
* #param scalingLogic Logic to use to avoid image stretching
* #return Optimal source rectangle
*/
public static Rect calculateSrcRect(int srcWidth, int srcHeight, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
if (scalingLogic == ScalingLogic.CROP) {
final float srcAspect = (float)srcWidth / (float)srcHeight;
final float dstAspect = (float)dstWidth / (float)dstHeight;
if (srcAspect > dstAspect) {
final int srcRectWidth = (int)(srcHeight * dstAspect);
final int srcRectLeft = (srcWidth - srcRectWidth) / 2;
return new Rect(srcRectLeft, 0, srcRectLeft + srcRectWidth, srcHeight);
} else {
final int srcRectHeight = (int)(srcWidth / dstAspect);
final int scrRectTop = (int)(srcHeight - srcRectHeight) / 2;
return new Rect(0, scrRectTop, srcWidth, scrRectTop + srcRectHeight);
}
} else {
return new Rect(0, 0, srcWidth, srcHeight);
}
}
/**
* Calculates destination rectangle for scaling bitmap
*
* #param srcWidth Width of source image
* #param srcHeight Height of source image
* #param dstWidth Width of destination area
* #param dstHeight Height of destination area
* #param scalingLogic Logic to use to avoid image stretching
* #return Optimal destination rectangle
*/
public static Rect calculateDstRect(int srcWidth, int srcHeight, int dstWidth, int dstHeight,
ScalingLogic scalingLogic) {
if (scalingLogic == ScalingLogic.FIT) {
final float srcAspect = (float)srcWidth / (float)srcHeight;
final float dstAspect = (float)dstWidth / (float)dstHeight;
if (srcAspect > dstAspect) {
return new Rect(0, 0, dstWidth, (int)(dstWidth / srcAspect));
} else {
return new Rect(0, 0, (int)(dstHeight * srcAspect), dstHeight);
}
} else {
return new Rect(0, 0, dstWidth, dstHeight);
}
}
public static String decodeFile(String path,int DESIREDWIDTH, int DESIREDHEIGHT, int type) {
String strMyImagePath = null;
Bitmap scaledBitmap = null;
Bitmap rotated = null;
try {
// Part 1: Decode image
Bitmap unscaledBitmap = ScalingUtilities.decodeFile(path, DESIREDWIDTH, DESIREDHEIGHT, ScalingLogic.FIT);
// if (!(unscaledBitmap.getWidth() <= DESIREDWIDTH && unscaledBitmap.getHeight() <= DESIREDHEIGHT)) {
// // Part 2: Scale image
// scaledBitmap = ScalingUtilities.createScaledBitmap(unscaledBitmap, DESIREDWIDTH, DESIREDHEIGHT, ScalingLogic.FIT);
// } else {
// unscaledBitmap.recycle();
// return path;
// }
// Store to tmp file
scaledBitmap = ScalingUtilities.createScaledBitmap(unscaledBitmap, DESIREDWIDTH, DESIREDHEIGHT, ScalingLogic.FIT);
String extr = Environment.getExternalStorageDirectory().toString();
File mFolder = new File(extr + com.vt.vsmart.utils.Config.SD_PATH+"/image");
if (!mFolder.exists()) {
mFolder.mkdir();
}
String s = type+"temp.jpg";
File f = new File(mFolder.getAbsolutePath(), s);
strMyImagePath = f.getAbsolutePath();
FileOutputStream fos = null;
try {
fos = new FileOutputStream(f);
// scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 95, fos);
// quay anh 90 do
Matrix matrix = new Matrix();
matrix.postRotate(90);
rotated = Bitmap.createBitmap(scaledBitmap, 0, 0, scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix, true);
rotated.compress(Bitmap.CompressFormat.JPEG, 95, fos);
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
// scaledBitmap.recycle();
rotated.recycle();
} catch (Throwable e) {
}
if (strMyImagePath == null) {
return path;
}
return strMyImagePath;
}
// check anh bi quay
public int getCameraPhotoOrientation(Context context, Uri imageUri, String imagePath){
int rotate = 0;
try {
context.getContentResolver().notifyChange(imageUri, null);
File imageFile = new File(imagePath);
ExifInterface exif = new ExifInterface(imageFile.getAbsolutePath());
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_270:
rotate = 270;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
rotate = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_90:
rotate = 90;
break;
}
// Log.i("RotateImage", "Exif orientation: " + orientation);
// Log.i("RotateImage", "Rotate value: " + rotate);
} catch (Exception e) {
e.printStackTrace();
}
return rotate;
}
}
It work for me. I hope it can hepl you!

Try this Method,this will convert your Image file to compressed format,and you can customized the compress level by varrying the value of x & y in the code(Indicated in comment line)
File mImageFile = saveBitmapToFile(ImageFile);
public File saveBitmapToFile(File file){
try {
// BitmapFactory options to downsize the image
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
o.inSampleSize = 6;
// factor of downsizing the image
FileInputStream inputStream = new FileInputStream(file);
//Bitmap selectedBitmap = null;
BitmapFactory.decodeStream(inputStream, null, o);
inputStream.close();
// The new size we want to scale to
final int REQUIRED_SIZE=200; // x............
// Find the correct scale value. It should be the power of 2.
int scale = 1;
while(o.outWidth / scale / 2 >= REQUIRED_SIZE &&
o.outHeight / scale / 2 >= REQUIRED_SIZE) {
scale *= 2;
}
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
inputStream = new FileInputStream(file);
Bitmap selectedBitmap = BitmapFactory.decodeStream(inputStream, null, o2);
inputStream.close();
// here i override the original image file
File outPutFile = File.createTempFile("abc","image");
FileOutputStream outputStream = new FileOutputStream(outPutFile);
// y.......
selectedBitmap.compress(Bitmap.CompressFormat.JPEG, 95 , outputStream);
return outPutFile;
} catch (Exception e) {
return null;
}
}
Thanks

Why am I getting a weird results from my scaleImage method?

I'm trying to scale an image in relation to the width/height. Here is my method:
private byte[] scaleImage(Bitmap image) {
byte[] image = new byte[]{};
int width= image.getWidth();
int height = image.getHeight();
int wh = width / height ;
int hw = height / width ;
int newHeight, newWidth;
if (width> 250 || height> 250) {
if (width> height) { //landscape-mode
newHeight= 250;
newWidth = Math.round((int)(long)(250 * wh));
Bitmap sizeChanged = Bitmap.createScaledBitmap(image, newWidth, newHeight, true);
int bytes = størrelseEndret.getByteCount();
ByteBuffer bb = ByteBuffer.allocate(bytes);
sizeChanged.copyPixelsFromBuffer(bb);
image = bb.array();
} else { //portrait-mode
newWidth = 250;
newHeight = Math.round((int)(long)(250 * hw));
...same
}
}
return image;
}
After that, I wrote some codes to convert the image from Bitmapto byte[] array, but after a Debug I noticed that I'm getting really weird values. For example:
width = 640, height = 480, but wh = 1, hw = 0, newHeight = 200 and newWidth = 200?! I simply don't understand why? what am I doing wrong? Any help or hints is very appreciate. Thanks, Carl

You're running into a problem of integer arithmetic, basically - you're performing a division to get a scaling factor, but as an integer - so for something like 640x480, the scaling factors would be 1 and 0, because 640/480 is 1, and 480/640 is 0.
Instead of handling this as (x1/y1)*y2, you can change it to (x1*y2)/y1 so that you perform the division afterwards. So long as you don't overflow the integer limit in the multiplication (unlikely here) it should be fine. So I'd rewrite your code as:
private byte[] scaleImage(Bitmap image) {
byte[] image = new byte[]{};
int width = image.getWidth();
int height = image.getHeight();
int newHeight, newWidth;
if (width > 250 || height > 250) {
if (width > height) { //landscape-mode
newHeight = 250;
newWidth = (newHeight * width) / height;
} else {
newWidth = 250;
newHeight = (newWidth * height) / width;
}
} else {
// Whatever you want to do here
}
// Now use newWidth and newHeight
}
(I would definitely separate the "calculating newWidth and newHeight" from "performing the scaling" if possible, to avoid repeated code.)

Rotating image on top of another image

I have a method that I want to rotate an image when the user enters the number of degrees to rotate it. The method does that, but the thing is it's rotating the image so that the new image lays on top of the old one (which I don't want it to do; I just want the new image by itself). The RotateTest is just an abbreviated form of the class with all of the methods needed in the ButtonListener class that should be relevant to rotating the image.
public class RotateTest {
public Rotate() {
try {
String path = "default.jpg";
File imageFile = new File(path);
imageURL = imageFile.toURI().toURL();
image = ImageIO.read(imageURL);
this.imageLabel = new JLabel(imageLabel);
} catch (IOException e) { }
}
public void setAngle(double angle) {
this.angle = angle;
}
public void setImage(BufferedImage img) {
this.image = img;
}
private class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent event) {
boolean doAgain = true;
Artsy artsy = new Artsy();
if(event.getSource() == rotate) {
//need something for cancel!
do {
String angleString = JOptionPane.showInputDialog("Please enter your angle in degrees.");
double angle = Double.parseDouble(angleString);
if(angle < 0) {
angle = 360 + angle;
}
setAngle(getAngle() + angle);
setImage(artsy.doRotate(image, angle));
revalidate();
repaint();
System.out.println("The angle is " + getAngle());
} while(JOptionPane.OK_OPTION == 1);
}
else {
if(doAgain) {
setImage(artsy.doRotate(image, 360 - getAngle()));
doAgain = false;
setAngle(0);
}
revalidate();
repaint();
System.out.println("The angle is " + getAngle());
}
}
}
And this is the other class with the method that rotates the image:
public class Artsy {
public BufferedImage doRotate(BufferedImage src, double angle) {
angle = Math.toRadians(angle);
Graphics2D g = (Graphics2D) src.getGraphics();
int w = src.getWidth();
int h = src.getHeight();
AffineTransform trans = new AffineTransform();
trans.rotate(angle, w / 2, h / 2);
AffineTransformOp scaleOp = new AffineTransformOp(trans, AffineTransformOp.TYPE_BILINEAR);
g.drawImage(scaleOp.filter(src, null), 0, 0, null);
g.dispose();
return src;
}
}
Thank you!!

Your code seems correct to me, i can't see an obvious mistake. Nevertheless the following function is working for my to rotate images so it should also be a solution for you:
public static BufferedImage rotate(BufferedImage srcImage, double angle)
{
double sin = Math.abs(Math.sin(Math.toRadians(angle))), cos = Math.abs(Math.cos(Math.toRadians(angle)));
int originWidth = srcImage.getWidth(), originHeight = srcImage.getHeight();
int newWidth = (int) Math.floor(originWidth * cos + originHeight * sin), newHeight = (int) Math.floor(originHeight * cos + originWidth * sin);
BufferedImage newImage = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = newImage.createGraphics();
g.translate((newWidth - originWidth) / 2, (newHeight - originHeight) / 2);
g.rotate(Math.toRadians(angle), originWidth / 2, originHeight / 2);
g.drawImage(srcImage, 0, 0, null);
g.dispose();
return newImage;
}
A helper function:
/**
* Converts an Icon to an Image
*/
public static Image iconToImage(Icon icon) {
if (icon instanceof ImageIcon) {
return ((ImageIcon) icon).getImage();
}
else {
int w = icon.getIconWidth();
int h = icon.getIconHeight();
GraphicsEnvironment ge =
GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gd.getDefaultConfiguration();
BufferedImage image = gc.createCompatibleImage(w, h);
Graphics2D g = image.createGraphics();
icon.paintIcon(null, g, 0, 0);
g.dispose();
return image;
}
}
Example usage to rotate the JLabels icon for 90 degrees clockwise:
BufferedImage buImg = new BufferedImage(imageLabel.getIcon().getIconWidth(), imageLabel.getIcon().getIconHeight(), BufferedImage.TYPE_INT_ARGB);
buImg.getGraphics().drawImage(iconToImage(imageLabel.getIcon()), 0, 0, null);
imageLabel.setIcon(new ImageIcon(rotate(buImg, 90)));

Image resizing : original color has been changed after the resize

I'm using Play!Framework 1.x, one of its useful tool is the class Images, which allow me to resize an Image on the fly.
Here's the code from Images.resize :
/**
* Resize an image
* #param originalImage The image file
* #param to The destination file
* #param w The new width (or -1 to proportionally resize) or the maxWidth if keepRatio is true
* #param h The new height (or -1 to proportionally resize) or the maxHeight if keepRatio is true
* #param keepRatio : if true, resize will keep the original image ratio and use w and h as max dimensions
*/
public static void resize(File originalImage, File to, int w, int h, boolean keepRatio) {
try {
BufferedImage source = ImageIO.read(originalImage);
int owidth = source.getWidth();
int oheight = source.getHeight();
double ratio = (double) owidth / oheight;
int maxWidth = w;
int maxHeight = h;
if (w < 0 && h < 0) {
w = owidth;
h = oheight;
}
if (w < 0 && h > 0) {
w = (int) (h * ratio);
}
if (w > 0 && h < 0) {
h = (int) (w / ratio);
}
if(keepRatio) {
h = (int) (w / ratio);
if(h > maxHeight) {
h = maxHeight;
w = (int) (h * ratio);
}
if(w > maxWidth) {
w = maxWidth;
h = (int) (w / ratio);
}
}
String mimeType = "image/jpeg";
if (to.getName().endsWith(".png")) {
mimeType = "image/png";
}
if (to.getName().endsWith(".gif")) {
mimeType = "image/gif";
}
// out
BufferedImage dest = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Image srcSized = source.getScaledInstance(w, h, Image.SCALE_SMOOTH);
Graphics graphics = dest.getGraphics();
graphics.setColor(Color.WHITE);
graphics.fillRect(0, 0, w, h);
graphics.drawImage(srcSized, 0, 0, null);
ImageWriter writer = ImageIO.getImageWritersByMIMEType(mimeType).next();
ImageWriteParam params = writer.getDefaultWriteParam();
FileImageOutputStream toFs = new FileImageOutputStream(to);
writer.setOutput(toFs);
IIOImage image = new IIOImage(dest, null, null);
writer.write(null, image, params);
toFs.flush();
toFs.close();
writer.dispose();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
Here's how I use it :
File old = new File("1.jpg");
File n = new File("output.jpg");
Images.resize(old, n, 800, 800, true);
The original image 1.jpg:
And the output.jpg:
Can anyone explain what's going on here ? Thanks !

I've seen this, too and believe it's an JRE bug. I worked around it by not using getScaledInstance and instead scaling while drawing.

Ah. I was too slow to answer. But yes, it is most likely a bug. Came across this problem myself. You have to work around it. Try scaling the image as Waldheinz said. That was what I did too.
This is the link I used to do my scaling :http://www.rgagnon.com/javadetails/java-0243.html, so you have more references in adition to waldheinz's

get RGB-YCbCr components of image

I want to show the jpeg image R_G_B channels as separated images in jlabel and the Y-Cb-Cr channels as well, I got the arrays but don't know how to convert them to images
///
Edit:
thanX very much , this is the method I'm writing ,Now It can display just the upper left quarter of the image ,and show it in a blue color whatever the color channel was?
public void getRGB_YCC(int width,int height,String inFileName) {
R=new int[height][width];G=new int[height][width];
B=new int[height][width];Y=new int[height][width];
Cb1=new int[height][width];Cr1=new int[height][width];
final int values[] = new int[width * height];
int r, g, b, Y_ch,Cb,Cr, y, x;
final PixelGrabber grabber = new PixelGrabber(image.getSource(), 0, 0,width,height, values, 0, width);
try {
if (grabber.grabPixels() != true) {
try {
throw new AWTException("Grabber returned false: " + grabber.getStatus());
} catch (final Exception e) {};
}
} catch (final InterruptedException e) {};
int index = 0;
for (y = 0; y < height; ++y) {
for (x = 0; x < width; ++x) {
r = values[index] >> 16 & 0xff;
g = values[index] >> 8 & 0xff;
b = values[index] & 0xff;
Y_ch= (int)(0.299 * r + 0.587 * g + 0.114 * b);
Cb= 128 + (int) (-0.16874 * r - 0.33126 * g + 0.5 * b);
Cr= 128 + (int)(0.5 * r - 0.41869 * g - 0.08131 * b);
R [y][x]=r;
G [y][x]=g;
B [y][x]=b;
Y [y][x]=Y_ch;
Cb1[y][x]=Cb;
Cr1[y][x]=Cr;
index++;
}
}
BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
int[] pixels = ((DataBufferInt)img.getRaster().getDataBuffer()).getData();
for( y=0;y<height;y++)
{
for( x=0;x<width;x++)
{
pixels[x + y*width] =R[y][x]<<16;
}
}
jLabel15.setIcon(new ImageIcon(img));
}

A simple and fast way to get an array of pixels into an image is using BufferedImage:
This example creates a grayscale 8 bit image and retrieves a 'pixel buffer' for it:
BufferedImage img = new BufferedImage(w, h, BufferedImage.TYPE_BYTE_GRAY);
byte[] pixels = ((DataBufferByte)img.getRaster().getDataBuffer()).getData();
This also works with RGB:
BufferedImage img = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
int[] pixels = ((DataBufferInt)img.getRaster().getDataBuffer()).getData();
You now can set pixels by just writing to the pixels array like pixels[x + y * w] = value and the results are instantly visible.