I am working in javafx BufferedImage.
I have two BufferedImages 1)Grayscaleimage and 2)rgbimage.
i want to merged this two images in that rgb image want to transperanet with black color.
How can i achirve this?
my code snippet is:
if (depth == 24)
{
bufferedImgCFM = getPixelArrayToBmpByteArray(
fbData.getBuf(), width, height, depth);
}
else
{
bufferedImgBMode = getPixelArrayToBmpByteArray(
fbData.getBuf(), width, height, depth);
}
finalimage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = (Graphics2D) finalimage.getGraphics();
if (bufferedImgBMode != null) {
g.drawImage(bufferedImgBMode, 0, 0, width, height, null);
}
if (bufferedImgCFM != null) {
g.drawImage(bufferedImgCFM, 0, 0, width, height, null);
}
Image image = SwingFXUtils.toFXImage(finalimage, null);
getPixelArrayToBmpByteArray method is:
private BufferedImage getPixelArrayToBmpByteArray(byte[] pixelData, int width,
int height, int depth) throws Exception {
int[] pixels = byteToInt(pixelData);
BufferedImage image = null;
if (depth == 8) {
image = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY);
} else if (depth == 24) {
image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//int[][] result = new int[height][width];
}
WritableRaster raster = (WritableRaster) image.getData();
raster.setPixels(0, 0, width, height, pixels);
image.setData(raster);
return image;
}
When i merged this two images second image that is rgb image will hide first image. i want to transperant rgb image with black.
Related
I try to join two images. But not able to create it.
I am not able to understand what is the problem in the below code.
It is not able to create the concat.jpg file.
BufferedImage image = ImageIO.read(mainFile);
BufferedImage image1 = ImageIO.read(fileToMerge);
int width = Math.max(image.getWidth() , image1.getWidth());
int height = Math.max(image.getHeight() , image1.getHeight());
log.info("width {}", width);
log.info("height {}", height);
BufferedImage concatImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics2D = concatImage.createGraphics();
graphics2D.drawImage(image, 0, image.getHeight(), null);
graphics2D.drawImage(image1, 0 , image1.getHeight(), null);
ImageIO.write(concatImage, "jpg", new File(Constants.LOCAL_FOLDER + "/concat.jpg"));
You want the height of concatImage to be the combined height of image and image1.
You want to draw image at coordinates (0,0) and you want to draw image1 at x = 0 and y = height of image
Try the following.
BufferedImage image = ImageIO.read(mainFile);
BufferedImage image1 = ImageIO.read(fileToMerge);
int width = Math.max(image.getWidth() , image1.getWidth());
int height = image.getHeight() + image1.getHeight();
log.info("width {}", width);
log.info("height {}", height);
BufferedImage concatImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics2D = concatImage.createGraphics();
graphics2D.drawImage(image, 0, 0, null);
graphics2D.drawImage(image1, 0, image.getHeight(), null);
ImageIO.write(concatImage, "jpg", new File(Constants.LOCAL_FOLDER + "/concat.jpg"));
Note that you should call graphics2D.dispose() when you no longer need to use it.
How can I create a black and white image using array of BLACK and WHITE pixels ?
int pixels[]= {-1, -16777216,-16777216,-16777216....}
Color w = new Color(Color.WHITE.getRGB());
int wi = w.getRGB();
Color b = new Color(Color.BLACK.getRGB());
int bi = b.getRGB();
I was trying to use this code but the result was only few black pixels.
public static BufferedImage getImageFromArray(int[] pixels, int width, int height) {
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
WritableRaster raster = (WritableRaster) image.getData();
raster.setDataElements(0, 0, width, height, pixels);
return image;
}
Not sure what exactly you are tying to create, but here are some nice examples:
http://www.lac.inpe.br/JIPCookbook/1100-create-bw.jsp
I need to draw a new image over old image. I first opened both images in BufferedImage and changed their white background to transparent. Then I got a Graphics2D object from the bufferedImage of old image and called drawImage method of Graphics2D class. I then saved the old image to disk. When I open the saved image I find only the old image with white background changed to transparent. Can anyone suggest me what is error with my code or how can I get to fix my error ?
BufferedImage newImage = ImageIO.read(new File("new.png"));
BufferedImage oldImage = ImageIO.read(new File("old.png"));
newImage = makeWhiteTransparent(newImage);
oldImage = makeWhiteTransparent(oldImage);
Graphics2D graphics = (Graphics2D) oldImage.getGraphics();
graphics.drawImage(newImage,null, 0,0);
File outputImage = new File("merged.png");
ImageIO.write(oldImage, "png", outputImage);
My makeWhiteTransparent method goes like this:
public static BufferedImage makeWhiteTransparent(BufferedImage img){
BufferedImage dst = new BufferedImage(img.getWidth(), img.getHeight(), BufferedImage.TYPE_4BYTE_ABGR);
dst.getGraphics().drawImage(img, 0, 0, null);
int markerRGB = Color.WHITE.getRGB() | 0xFF000000;
int width = dst.getWidth();
int height = dst.getHeight();
for(int x = 0; x < width; x++){
for(int y = 0; y < height; y++){
int rgb = dst.getRGB(x, y);
if ( ( rgb | 0xFF000000 ) == markerRGB ) {
int value = 0x00FFFFFF & rgb;
dst.setRGB(x, y, value);
}
}
}
return dst;
}
I tried changing graphics.drawImage(newImage, null,0,0) to graphics.drawImage(newImage, 0,0, null) and also changing TYPE_4BYTE_ABGR to TYPE_INT_ARGB as suggested but it did nothing. The error still exists.
This needs to be changed:
graphics.drawImage(newImage,null, 0,0);
to
graphics.drawImage(newImage, 0,0, null);
you are using the wrong version of drawImage - check http://docs.oracle.com/javase/7/docs/api/java/awt/Graphics2D.html
--
Change also the type TYPE_4BYTE_ABGR to TYPE_INT_ARGB
--
Here's how it works for me:
public BufferedImage makeWhiteTransparent(BufferedImage img){
BufferedImage dst = new BufferedImage(img.getWidth(), img.getHeight(), BufferedImage.TYPE_INT_ARGB);
dst.getGraphics().drawImage(img, 0, 0, null);
int markerRGB = 0x00ffffff; // Color.WHITE.getRGB() | 0xFF000000;
int width = dst.getWidth();
int height = dst.getHeight();
for(int x = 0; x < width; x++){
for(int y = 0; y < height; y++){
int rgb = dst.getRGB(x, y)&0x00ffffff;
if ( rgb == markerRGB ) {
int value = 0x00FFFFFF & rgb;
dst.setRGB(x, y, value);
}
}
}
return dst;
}
bim = makeWhiteTransparent(bim);
bim2 = makeWhiteTransparent(bim2);
Graphics2D graphics = (Graphics2D) bim.getGraphics();
graphics.drawImage(bim2,0,0, null);
g2.drawImage(bim, w/2-wc/2, h/2-hc/2, null);
I got the answer to my question finally. All I had to do was create a new BufferedImage and draw two images over it. Below is the code that works as expected:
BufferedImage newImage = ImageIO.read(new File("new.png"));
BufferedImage oldImage = ImageIO.read(new File("old.png"));
oldImage = makeWhiteTransparent(oldImage);
newImage = makeWhiteTransparent(newImage);
int width = Math.max(newImage.getWidth(), oldImage.getWidth());
int height = Math.max(newImage.getHeight(), oldImage.getHeight());
BufferedImage combined = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics graphics = combined.getGraphics();
graphics.drawImage(oldImage, 0, 0, null);
graphics.drawImage(newImage, 0, 0, null);
File outputImage = new File("merged.png");
ImageIO.write(combined, "PNG", outputImage);
I am trying to use Tesseract OCR for scanning text in an image. However the background is dark and Tesseract is not able to scan thru for the text.
I need help with java code to clear the background gray color from the image.
I have tried below code, where i set the last parameter, Color, as "COLOR.WHITE" (suggested by someone on this forum but it did not help).
static public BufferedImage scaleImage(BufferedImage img, int width, int height,
Color background) {
int imgWidth = img.getWidth();
int imgHeight = img.getHeight();
if (imgWidth*height < imgHeight*width) {
width = imgWidth*height/imgHeight;
} else {
height = imgHeight*width/imgWidth;
}
BufferedImage newImage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = newImage.createGraphics();
try {
g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC);
g.setBackground(background);
g.clearRect(0, 0, width, height);
g.drawImage(img, 0, 0, width, height, null);
} finally {
g.dispose();
}
return newImage;
}
Thanks.
i am working on image comparison in java. I think before going to compare the images, it is better to process the images for setting a fixed size image. Is there any java functionality to resize the images. I want to rescale the images to 300*225.
BufferedImage img = ImageIO.read(imageFile);
Image scaled = img.getScaledInstance(300, 255, Image.SCALE_DEFAULT);
You can also take a look at the java-image-scaling library.
public ImageIcon resizeImage(String filePath, int w, int h) {
String data = filePath;
BufferedImage bsrc, bdest;
ImageIcon theIcon;
//scale the image
try
{
bsrc = ImageIO.read(new File(data));
bdest = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bdest.createGraphics();
AffineTransform at = AffineTransform.getScaleInstance((double) w / bsrc.getWidth(),
(double) h / bsrc.getHeight());
g.drawRenderedImage(bsrc, at);
//add the scaled image
theIcon = new ImageIcon(bdest);
return theIcon;
}
catch (Exception e)
{
System.out.println("This image can not be resized. Please check the path and type of file.");
return null;
}
}
BufferedImage createResizedCopy(Image originalImage,
int scaledWidth, int scaledHeight,
boolean preserveAlpha)
{
int imageType = preserveAlpha ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB;
BufferedImage scaledBI = new BufferedImage(scaledWidth, scaledHeight, imageType);
Graphics2D g = scaledBI.createGraphics();
if (preserveAlpha) {
g.setComposite(AlphaComposite.Src);
}
g.drawImage(originalImage, 0, 0, scaledWidth, scaledHeight, null);
g.dispose();
return scaledBI;
}
This threads answers your question well
Very interesting article on manipulating images