I'm currently using Apache POI 3.16 to take a PPTX slide deck and transform it into a set of .png thumbnails. I modeled my PPTX to PNG function closely off of a few pre-made solutions I found across the web.
I'm having issues primarily with text being rendered about 6-8pt larger in the resulting PNGs. Additionally, complex shapes such as hexagons are extremely skewed when being rendered. Can anyone suggest any fixes? I'm mostly concerned with the font sizes being much larger.
Here is my code, commented for readability:
public List<String> generatePNGThumbnails(String inputFilePath) {
// List of the thumbnail paths that will be returned.
ArrayList<String> thumbnailFilePaths = new ArrayList<>();
// Open the file.
File inputFile = new File(inputFilePath);
try {
// Open the PPTX as an XMLSlideShow.
XMLSlideShow slideShow = new XMLSlideShow(OPCPackage.open(inputFile));
// Output size for rendered images.
Dimension pageSize = slideShow.getPageSize();
int width = (int)(pageSize.width * TRANSFORMATION_SCALE);
int height = (int)(pageSize.height * TRANSFORMATION_SCALE);
// Get a list of the slides in the PPTX.
List<XSLFSlide> slides = slideShow.getSlides();
for (int i = 0; i < slides.size(); i++) {
XSLFSlide slide = slides.get(i);
// Create a new image object and prepare it for rendering.
BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics = img.createGraphics();
// Set graphics rendering options and draw the PPTX slide to the image.
graphics.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON
);
graphics.setRenderingHint(
RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY
);
graphics.setRenderingHint(
RenderingHints.KEY_COLOR_RENDERING,
RenderingHints.VALUE_COLOR_RENDER_QUALITY
);
graphics.setRenderingHint(
RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC
);
graphics.setRenderingHint(
RenderingHints.KEY_FRACTIONALMETRICS,
RenderingHints.VALUE_FRACTIONALMETRICS_ON
);
graphics.setRenderingHint(
RenderingHints.KEY_ALPHA_INTERPOLATION,
RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY
);
graphics.setColor(Color.white);
graphics.clearRect(0, 0, width, height);
graphics.scale(TRANSFORMATION_SCALE, TRANSFORMATION_SCALE);
// Draw the slide to the 2DGraphics.
slide.draw(graphics);
// Save the newly created image to the local disk.
String slideFileName = "slide" + i + ".pptx";
FileOutputStream fileOutputStream = new FileOutputStream(slideFileName);
ImageIO.write(img, "png", fileOutputStream);
// Add the output file path to the list of paths to be returned.
thumbnailFilePaths.add(slideFileName);
// Clean up before proceeding to the next slide.
graphics.dispose();
img.flush();
fileOutputStream.close();
}
} catch (InvalidFormatException | IOException e) {
// ...
}
}
Related
I know that it is possible to set the color of the run by: How can I set background colour of a run (a word in line or a paragraph) in a docx file by using Apache POI?
The relevant code is for example (see the answer in the referenced question):
XWPFRun run=paragraph.createRun();
run.setText("background color");
CTShd cTShd = run.getCTR().addNewRPr().addNewShd();
cTShd.setVal(STShd.CLEAR);
cTShd.setColor("auto");
cTShd.setFill("00FFFF");
I would like to use an image instead as a pattern, is it possible? I know that the argument used for the fill argument is an object, so is it possible to use a picture reference or something like that?
I also know how to add directly a picture in a docx document, for example:
Image image = // my image to use
float widthEMU = // the width of the image in EMU
float heightEMU = // the height of the image in EMU
BufferedImage bimage = new BufferedImage((int) width, (int) height, BufferedImage.TYPE_INT_ARGB);
// Draw the image on to the buffered image
Graphics2D bGr = bimage.createGraphics();
bGr.drawImage(_image, 0, 0, null);
bGr.dispose();
ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(bimage, "png", os);
InputStream is = new ByteArrayInputStream(os.toByteArray());
XWPFPicture pic = run.addPicture(is, XWPFDocument.PICTURE_TYPE_PNG, "Picture", widthEMU, heightEMU);
I have code to convert pptx slide into image and display the image in swing panel.
When i run my code in eclipse, it takes 10 Sec to display the panel whereas same code run via jar, it takes more than one minute to open the panel.
It happens only when user open it first time, Later it loads faster.
Any help would be appreciated and thanks in advance.
Here i included the code
// currentPage - Slide number to display
// source - pptx file path
public void Display(int currentPage, String source) {
try {
FileInputStream is = new FileInputStream(source);
XMLSlideShow ppt = new XMLSlideShow(is);
is.close();
double zoom = 1; // magnify it by 2
AffineTransform at = new AffineTransform();
at.setToScale(zoom, zoom);
Dimension pgsize = ppt.getPageSize();
XSLFSlide[] slides = ppt.getSlides();
all = slides.length;
lblPage.setText(currentPage + " / " + all);
current = currentPage;
BufferedImage img = new BufferedImage(pgsize.width, pgsize.height, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics = img.createGraphics();
graphics.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
graphics.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
graphics.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
graphics.transform(at);
graphics.setColor(Color.white);
graphics.clearRect(0, 0, pgsize.width, pgsize.height);
graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
System.out.println("Before draw: " + new Date());
slides[currentPage - 1].draw(graphics);
System.out.println("After draw: " + new Date());
// save the output
Image newImg = img.getScaledInstance(lblPresentasi.getWidth(), lblPresentasi.getHeight(), Image.SCALE_SMOOTH);
final ImageIcon icon = new ImageIcon(newImg);
lblPresentasi.setIcon(icon);
lblPresentasi.addComponentListener(new ComponentAdapter() {
#Override
public void componentResized(ComponentEvent e) {
JLabel label = (JLabel) e.getComponent();
Dimension size = label.getSize();
Image resized = icon.getImage().getScaledInstance(size.width-10, size.height-10, Image.SCALE_FAST);
label.setIcon(new ImageIcon(resized));
}
});
graphics.dispose();
newImg.flush();
} catch (Exception e) {
e.printStackTrace();
}
}// end of method Display()
This delay was caused by One-Jar custom class loader. At first time, it takes more time to load the dependency libraries and load it classes.
So, I removed one-jar and using JarSplice to load the dependency libraries classes , it works great.
I am writing a code to make an image file of a chart appearing on a panel. For that purpose I create the buffered image of that and then use ImageIO.write(). It works but it only displays the panel(grey coloured panel) but does not show the chart present on that panel. What to do in this case?? Here is my code
com.objectplanet.chart.NonFlickerPanel p =
new com.objectplanet.chart.NonFlickerPanel(new BorderLayout());
p.add("Center", chart); // this statements adds the chart in the center of the panel
ChartPanel.add("Center", p);
ChartPanel.setSize(500, 200);
ChartPanel.show();
int w = ChartPanel.getWidth();
int h = ChartPanel.getHeight();
BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bi.createGraphics();
ChartPanel.paint(g);
ChartPanel.printAll(g);
File f = new File("D:\\image.png");
try {
// png is an image format (like gif or jpg)
ImageIO.write(bi, "png", f);
} catch (IOException ex) {
ex.printStackTrace();
}
Well i solved the problem .Anyone facing the same problem ,here is the solution
Use paintall function rather than just paint function
i am using Graphics2D in java to resize images, it works perfect with jpg,png and other formats.
my problem is the animated GIF images, after re-sizing the animation is gone!
here is the method am using:
private BufferedImage doResize(int newWidth, int newHeight, double scaleX,
double scaleY, BufferedImage source) {
GraphicsConfiguration gc = getDefaultConfiguration();
BufferedImage result = gc.createCompatibleImage(newWidth, newHeight, source.getColorModel().getTransparency());
Graphics2D g2d = null;
try {
g2d = result.createGraphics();
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.scale(scaleX, scaleY);
g2d.drawImage(source, 0, 0, null);
} finally {
if (g2d != null) {
g2d.dispose();
}
}
return result;
}
so, any clues how can i keep on the animated gif after re-sizing?
Thanks.
So I know this is old but I found a solution, I am using Java 8 not sure if it will work with other versions.
ImageIcon image = ? (whatever/wherever your gif is)
int width = 100;
int height = 100;
image.setImage(image.getImage().getScaledInstance(width, height, Image.SCALE_DEFAULT));
you can change SCALE_DEFAULT to the ones listed here except for SCALE_SMOOTH and SCALE_AREA_AVREAGING didn't work for me, it was blank
https://docs.oracle.com/javase/7/docs/api/java/awt/Image.html
I found two sources which when combined can be used to resize the image while keeping the animation.
On this question (
Convert each animated GIF frame to a separate BufferedImage ) look for the answer by Alex Orzechowski. His code takes a gif file and converts it to an array of ImageFrames (which is a class he made which wraps a BufferedImage). Then look at this code which converts a sequence of BufferedImages to a gif file
( http://elliot.kroo.net/software/java/GifSequenceWriter/ ).
As you could probably guess, all you need to do is upload the gif, use Alex's code to convert it to an array of ImageFiles/BufferedImages, use your Graphics2D code to resize each frame (you'll need to add a setImage method to Alex's ImageFrame class), then use Elliot's code to convert the array to a gif! Here is what mine looks like:
public static void main( String[] args )
{
try {
File imageFile = new File( "InputFile" );
FileInputStream fiStream = new FileInputStream( imageFile );
ImageFrame[] frames = readGif( fiStream );
for( int i = 0; i < frames.length; i++ ){
//code to resize the image
BufferedImage image = ImageUtilities.resizeImage( frames[ i ].getImage(), newWidth, newHeight);
frames[ i ].setImage( image );
}
ImageOutputStream output =
new FileImageOutputStream( new File( "OutputFile" ) );
GifSequenceWriter writer =
new GifSequenceWriter( output, frames[0].getImage().getType(), frames[0].getDelay(), true );
writer.writeToSequence( frames[0].getImage() );
for ( int i = 1; i < frames.length; i++ ) {
BufferedImage nextImage = frames[i].getImage();
writer.writeToSequence( nextImage );
}
writer.close();
output.close();
}
catch ( FileNotFoundException e ) {
System.out.println( "File not found" );
}
catch ( IOException e ) {
System.out.println( "IO Exception" );
}
}
This code, however, does not account for gif images with different amount of time elapsing between frames.
Jonny March's solution did not work for me because it processes and outputs only the first image of GIF file.
Here is my solution, it keeps the animation while resizing.
File f = new File("path of your animated gif");
URL img = f.toURL();
ImageIcon icon = new ImageIcon(img);
//You have to convert it to URL because ImageIO just ruins the animation
int width = 100;
int height = 100;
icon.setImage(icon.getImage().getScaledInstance(width, height,Image.SCALE_DEFAULT));
BufferedImage origBuffImg = ImageIO.read(orignalImage);
int type = origBuffImg.getType() == 0? BufferedImage.TYPE_INT_ARGB : origBuffImg.getType();
BufferedImage resizedBuffImg = new BufferedImage(width, height, type);
Graphics2D g = resizedBuffImg.createGraphics();
g.drawImage(origBuffImg, 0, 0, width, height, null);
g.dispose();
String newFile = orignalImage.getAbsolutePath().substring(0,orignalImage.getAbsolutePath().lastIndexOf("."))+"_"+width+"x"+height+"."+extension;
ImageIO.write(resizedBuffImg, extension, new File(newFile));
System.out.println("File created : "+newFile);
I'm using PDFBox to generate PDF files, however when I try to draw an image which I receive from an array of bytes I get the following error:
Insufficient data for an image
This is the basic structure of my code:
public ByteArrayOutputStream generatePDF() {
.. Variable Declaration
// Creating Document
document = new PDDocument();
// Creating Pages
for(int i = 0; i < arrayVar.length; i++) {
// Adding page to document
page = new PDPage();
// Creating FONT Attributes
fontNormal = PDType1Font.HELVETICA;
fontBold = PDType1Font.HELVETICA_BOLD;
// Building Front & Back Invoice Images
singleImageMap = // Getting Map With Array Of Bytes from Web Service Call;
if(singleImageMap != null && !singleImageMap.isEmpty()) {
arrayFront = Utils.readImage((byte[]) singleImageMap.get(Constants.WS_IMAGE_FRONT));
arrayBack = Utils.readImage((byte[]) singleImageMap.get(Constants.WS_IMAGE_BACK));
fileFront = new ByteArrayInputStream(arrayFront);
fileBack = new ByteArrayInputStream(arrayBack);
bufferedImageFront = ImageIO.read(fileFront);
bufferedImageBack = ImageIO.read(fileBack);
rescaledFrontImg = Scalr.resize(bufferedImageFront, 500);
rescaledBackImg = Scalr.resize(bufferedImageBack, 500);
front = new PDJpeg(document, rescaledFrontImg);
back = new PDJpeg(document, rescaledBackImg);
}
// Next we start a new content stream which will "hold" the to be created content.
contentStream = new PDPageContentStream(document, page);
// Let's define the content stream
contentStream.beginText();
contentStream.setFont(fontNormal, 8);
contentStream.moveTextPositionByAmount(200, 740);
contentStream.drawString("NAME: " + arrayVar[i].getParameter(Constants.NAME));
contentStream.endText();
if(front != null && back != null) {
contentStream.drawImage(front, 55, 500);
contentStream.drawImage(back, 55, 260);
}
// Add Page
document.addPage(page);
// Let's close the content stream
contentStream.close();
}
// Let's create OutputStream object
output = new ByteArrayOutputStream();
// Finally Let's save the PDF
document.save(output);
document.close();
return output;
}
Since I receive a PNG file from the Web Service I do the conversion to JPG with the following method:
public static byte[] readImage(byte[] file) throws Exception {
ImageInputStream is = ImageIO.createImageInputStream(new ByteArrayInputStream(file));
BufferedImage originalImage = ImageIO.read(is);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(originalImage, "jpg", baos );
byte[] imageInByte = baos.toByteArray();
return imageInByte;
}
As per this link:
https://issues.apache.org/jira/browse/PDFBOX-849
It points out that the error is because the PDJepg object should be created before the creation of the contentStream, but that's what I do in my code.
I'm not sure if there is a problem with the structure of my code, or that maybe there is an error in the way I'm handling the image bytes I'm getting from the Web Service call.
Does anyone has an idea of what could be the problem?
UPDATE
I did what Zelter Ady and indeed the image that I'm getting from the Web Service is valid since I was able to generate a physical file with it, so the problem should be somewhere around the manipulation of the image, the thing is I don't know what I'm missing.
I've got the same problem. With some images, Acrobat failed to display pages with this message:
Insufficient data for an image
My problem came from the colorModel in some jpeg images.
To track which images weren't ok, i log the BufferedImage colorModel by log.warn(img.getColorModel());
[VisualLocatorServlet.doGet:142] ColorModel: #pixelBits = 24 numComponents = 3 color space = java.awt.color.ICC_ColorSpace#4b7fce transparency = 1 has alpha = false isAlphaPre = false
[VisualLocatorServlet.doGet:142] ColorModel: #pixelBits = 24 numComponents = 3 color space = java.awt.color.ICC_ColorSpace#4b7fce transparency = 1 has alpha = false isAlphaPre = false
[VisualLocatorServlet.doGet:142] ColorModel: #pixelBits = 8 numComponents = 1 color space = java.awt.color.ICC_ColorSpace#19ef899 transparency = 1 has alpha = false isAlphaPre = false
Obviously, failing images are 8-bits encoded.
To fix that, i did the following:
byte[] buffer = null;
ByteArrayOutputStream out = new ByteArrayOutputStream();
BufferedImage img = ImageIO.read(new URL(visual));
/* resample 8-bits to 24-bits if necessary to fix pdf corruption */
if(img.getColorModel().getNumColorComponents()==1){
log.warn("components #1"+img.getColorModel());
BufferedImage out = new BufferedImage(w, h, BufferedImage.TYPE_3BYTE_BGR);
Graphics2D g2 = out.createGraphics();
g2.setBackground(Color.WHITE);
g2.drawImage(i, 0, 0, null);
g2.dispose();
log.warn("redrawn image "+img.getColorModel());
}
ImageIO.write(img, "jpeg", out);
...
The main point is to recreate a BufferedImage in 24bits. (BufferedImage.TYPE_3BYTE_BGR).
This may be an issue on the Adobe viewer side rather than at creation time. There's a known issue with the latest Acrobat versions: “Insufficient data for an image” error after updating to 10.1.4 or 9.5.2:
http://blogs.adobe.com/dmcmahon/2012/08/21/acrobat-insufficient-data-for-an-image-error-after-updating-to-10-1-4-or-9-5-2/
Before the build of the pdf try to save the image in a file, just to see the image is complete and can be saved.
You may use something like this to test the received image:
System.IO.File.WriteAllBytes("c:\\tmp.png", (byte[]) singleImageMap.get(Constants.FRONT));
and then open the image in a imageviewer. If the image cannot be open, then u have an error here. If the image is ok.... at least you know that this part is ok!
Well after a lot of debugging I found that the problem was here:
front = new PDJpeg(document, rescaledFrontImg);
back = new PDJpeg(document, rescaledBackImg);
The PDJpeg class has two constructors:
PDJpeg(PDDocument doc, BufferedImage bi)
PDJpeg(PDDocument doc, InputStream is)
I was passing a BufferedImage and at some point that I still can't figure out, I assume all the bytes were not being completely sent thus I got the message "Insufficient Data For An Image".
Solution: I passed an InputStream instead of a BufferedImage.
I still don't know why I got that error using a BufferedImage maybe I needed to do some sort of .push()?
This code worked for me.
import java.awt.Dimension;
import java.awt.image.BufferedImage;
import org.apache.commons.imaging.Imaging;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.graphics.image.JPEGFactory;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
public void generatePdfFromTifPbox(File sourceFile, String destinationPath) throws Exception {
//sourceFile is tiff file, destinationPath is pdf destination path with pdf file name
PDDocument doc = new PDDocument();
List<BufferedImage> bimages = Imaging.getAllBufferedImages(sourceFile);
for (BufferedImage bi : bimages) {
PDPage page = new PDPage();
doc.addPage(page);
PDPageContentStream contentStream = new PDPageContentStream(doc, page);
try {
// the .08F can be tweaked. Go up for better quality,
// but the size of the PDF will increase
PDImageXObject image = JPEGFactory.createFromImage(doc, bi, 0.08f);
Dimension scaledDim = getScaledDimension(new Dimension(image.getWidth(), image.getHeight()),
new Dimension((int) page.getMediaBox().getWidth(), (int) page.getMediaBox().getHeight()));
contentStream.drawImage(image, 1, 1, scaledDim.width, scaledDim.height);
} finally {
contentStream.close();
}
}
doc.save(destinationPath);
}
private Dimension getScaledDimension(Dimension imgSize, Dimension boundary) {
int original_width = imgSize.width;
int original_height = imgSize.height;
int bound_width = boundary.width;
int bound_height = boundary.height;
int new_width = original_width;
int new_height = original_height;
// first check if we need to scale width
if (original_width > bound_width) {
// scale width to fit
new_width = bound_width;
// scale height to maintain aspect ratio
new_height = (new_width * original_height) / original_width;
}
// then check if we need to scale even with the new height
if (new_height > bound_height) {
// scale height to fit instead
new_height = bound_height;
// scale width to maintain aspect ratio
new_width = (new_height * original_width) / original_height;
}
return new Dimension(new_width, new_height);
}
Reference/Courtesy: http://www.paulzepernick.com/java/java-apache-pdfbox-convert-multipage-tiff-to-pdf/
Maven dependency:
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>2.0.3</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-imaging</artifactId>
<version>1.0-alpha1</version>
</dependency>