Java Code Examples for javax.imageio.plugins.jpeg.JPEGImageWriteParam#setCompressionQuality()

/**
 * This static method writes the indicated renderedImage (BufferedImage)
 * to the indicated file.
 *
 * @param writeFile The File that shall receive the jpg data
 * @param renderedImage The RenderedImage (BufferedImage) to be written
 * @param jpgQuality The quality with which to compress to jpg
 */
public static void writeJpg(File writeFile, RenderedImage renderedImage, float jpgQuality) {
  Iterator writers = ImageIO.getImageWritersByFormatName("jpg");
  ImageWriter writer = (ImageWriter) writers.next();
  JPEGImageWriteParam params = new JPEGImageWriteParam(null);
  params.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
  params.setCompressionQuality(jpgQuality);
  params.setProgressiveMode(ImageWriteParam.MODE_DISABLED);
  params.setDestinationType(new ImageTypeSpecifier(java.awt.image.IndexColorModel.getRGBdefault(),
      IndexColorModel.getRGBdefault().createCompatibleSampleModel(16, 16)));

  try (ImageOutputStream ios = ImageIO.createImageOutputStream(new FileOutputStream(writeFile))) {
    writer.setOutput(ios);
    writer.write(null, new IIOImage(renderedImage, null, null), params);
    ios.close();
  } catch (IOException e) {
    // Tools.log("ScalablePicture.writeJpg caught IOException: " + e.getMessage() + "\nwhile writing " +
    // writeFile.toString());
    e.printStackTrace();
  }
  // writer = null;
  writer.dispose(); // 1.4.1 documentation says to do this.
}
 

private static void writeJpegImage(ImageHolder image, OutputStream os) throws OpenStegoException {
    try {
        JPEGImageWriteParam jpegParams = new JPEGImageWriteParam(null);
        jpegParams.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        jpegParams.setOptimizeHuffmanTables(true);
        Float qual = UserPreferences.getFloat("image.writer.jpeg.quality");
        if (qual == null) {
            qual = 0.75f;
        }
        jpegParams.setCompressionQuality(qual);

        ImageWriter writer = ImageIO.getImageWritersByFormatName("jpg").next();
        writer.setOutput(ImageIO.createImageOutputStream(os));
        writer.write(null, new IIOImage(image.getImage(), null, image.getMetadata()), jpegParams);
    } catch (IOException e) {
        throw new OpenStegoException(e);
    }
}
 

/** {@inheritDoc} */
@Override
protected ImageWriteParam getDefaultWriteParam(
        ImageWriter iiowriter, RenderedImage image,
        ImageWriterParams params) {
    JPEGImageWriteParam param = new JPEGImageWriteParam(iiowriter.getLocale());
    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    param.setCompressionQuality(params.getJPEGQuality());
    if (params.getCompressionMethod() != null
            && !"JPEG".equals(params.getCompressionMethod())) {
        throw new IllegalArgumentException(
                "No compression method other than JPEG is supported for JPEG output!");
    }
    if (params.getJPEGForceBaseline()) {
        param.setProgressiveMode(JPEGImageWriteParam.MODE_DISABLED);
    }
    return param;
}
 

@Override
public void writeImageFile(OutputStream outStream, String format, ByteBuffer imageData, int width, int height) throws IOException {
    BufferedImage awtImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
    Screenshots.convertScreenShot2(imageData.asIntBuffer(), awtImage);

    ImageWriter writer = ImageIO.getImageWritersByFormatName(format).next();
    ImageWriteParam writeParam = writer.getDefaultWriteParam();

    if (format.equals("jpg")) {
        JPEGImageWriteParam jpegParam = (JPEGImageWriteParam) writeParam;
        jpegParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        jpegParam.setCompressionQuality(0.95f);
    }

    awtImage = verticalFlip(awtImage);
    
    ImageOutputStream imgOut = new MemoryCacheImageOutputStream(outStream);
    writer.setOutput(imgOut);
    IIOImage outputImage = new IIOImage(awtImage, null, null);
    try {
        writer.write(null, outputImage, writeParam);
    } finally {
        imgOut.close();
        writer.dispose();
    }
}
 

public boolean saveImage_Jpeg(String file, int width, int height, int dpi) {
    double scaleFactor = dpi / 72.0;
    BufferedImage bufferedImage = new BufferedImage((int)(width * scaleFactor), (int)(height * scaleFactor), BufferedImage.TYPE_INT_RGB);
    Graphics2D g = bufferedImage.createGraphics();
    AffineTransform at = g.getTransform();
    at.scale(scaleFactor, scaleFactor);
    g.setTransform(at);
    paintGraphics(g, width, height);

    try {
        // Image writer 
        ImageWriter imageWriter = ImageIO.getImageWritersBySuffix("jpeg").next();
        ImageOutputStream ios = ImageIO.createImageOutputStream(new File(file));
        imageWriter.setOutput(ios);

        // Compression
        JPEGImageWriteParam jpegParams = (JPEGImageWriteParam) imageWriter.getDefaultWriteParam();
        jpegParams.setCompressionMode(JPEGImageWriteParam.MODE_EXPLICIT);
        jpegParams.setCompressionQuality(0.85f);

        // Metadata (dpi)
        IIOMetadata data = imageWriter.getDefaultImageMetadata(new ImageTypeSpecifier(bufferedImage), jpegParams);
        Element tree = (Element) data.getAsTree("javax_imageio_jpeg_image_1.0");
        Element jfif = (Element) tree.getElementsByTagName("app0JFIF").item(0);
        jfif.setAttribute("Xdensity", Integer.toString(dpi));
        jfif.setAttribute("Ydensity", Integer.toString(dpi));
        jfif.setAttribute("resUnits", "1"); // density is dots per inch	
        data.setFromTree("javax_imageio_jpeg_image_1.0", tree);

        // Write and clean up
        imageWriter.write(null, new IIOImage(bufferedImage, null, data), jpegParams);
        ios.close();
        imageWriter.dispose();
    } catch (Exception e) {
        return false;
    }
    g.dispose();

    return true;
}
 

private boolean saveImage_Jpeg(String file, int width, int height, int dpi) {
    double scaleFactor = dpi / 72.0;
    BufferedImage bufferedImage = new BufferedImage((int)(width * scaleFactor), (int)(height * scaleFactor), BufferedImage.TYPE_INT_RGB);
    Graphics2D g = bufferedImage.createGraphics();
    AffineTransform at = g.getTransform();
    at.scale(scaleFactor, scaleFactor);
    g.setTransform(at);
    paintGraphics(g);

    try {
        // Image writer 
        ImageWriter imageWriter = ImageIO.getImageWritersBySuffix("jpeg").next();
        ImageOutputStream ios = ImageIO.createImageOutputStream(new File(file));
        imageWriter.setOutput(ios);

        // Compression
        JPEGImageWriteParam jpegParams = (JPEGImageWriteParam) imageWriter.getDefaultWriteParam();
        jpegParams.setCompressionMode(JPEGImageWriteParam.MODE_EXPLICIT);
        jpegParams.setCompressionQuality(0.85f);

        // Metadata (dpi)
        IIOMetadata data = imageWriter.getDefaultImageMetadata(new ImageTypeSpecifier(bufferedImage), jpegParams);
        Element tree = (Element) data.getAsTree("javax_imageio_jpeg_image_1.0");
        Element jfif = (Element) tree.getElementsByTagName("app0JFIF").item(0);
        jfif.setAttribute("Xdensity", Integer.toString(dpi));
        jfif.setAttribute("Ydensity", Integer.toString(dpi));
        jfif.setAttribute("resUnits", "1"); // density is dots per inch	
        data.setFromTree("javax_imageio_jpeg_image_1.0", tree);

        // Write and clean up
        imageWriter.write(null, new IIOImage(bufferedImage, null, data), jpegParams);
        ios.close();
        imageWriter.dispose();
    } catch (Exception e) {
        return false;
    }
    g.dispose();

    return true;
}
 

@Override
public BufferedImage apply(BufferedImage img) {

	if(compressionLevel == 0f)
		return img;
	
	try {
		ImageWriter iw = ImageIO.getImageWritersByFormatName("jpeg").next();
		JPEGImageWriteParam iwp = (JPEGImageWriteParam) iw.getDefaultWriteParam();
		iwp.setOptimizeHuffmanTables(false);
		iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
		iwp.setProgressiveMode(ImageWriteParam.MODE_DISABLED);
		iwp.setCompressionQuality(1f-compressionLevel);


		ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
		iw.setOutput(new MemoryCacheImageOutputStream(baos)); 

		IIOImage outputImage = new IIOImage(img, null, null);
		iw.write(null, outputImage, iwp);
		iw.dispose();
		
		baos.flush(); 
		byte[] returnImage = baos.toByteArray(); 
		baos.close();
		
		
		BufferedImage img2 = ImageIO.read(new ByteArrayInputStream(returnImage));
		
		if(img2 == null)
			throw new Exception();
		else
			img = img2;

	} catch (Exception e) {
		e.printStackTrace();
	}

	return img;
}
 

private static ImageAndResolution convertToInputStreamJPG(BufferedImage buffImage, int dpi) throws IOException {
	ImageWriter writer = getImageWriter("jpeg");

	JPEGImageWriteParam jpegParams = (JPEGImageWriteParam) writer.getDefaultWriteParam();
	jpegParams.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
	jpegParams.setCompressionQuality(1);

	ImageTypeSpecifier typeSpecifier = ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_INT_RGB);
	IIOMetadata metadata = writer.getDefaultImageMetadata(typeSpecifier, jpegParams);

	initDpiJPG(metadata, dpi);

	return getImageAndResolution(buffImage, dpi, writer, jpegParams, metadata);
}
 

@Override
public void writeBufferedImage(BufferedImage bufferedImage, float quality, int dpi, String formatName, File targetFile) throws Exception {

    if (formatName.equalsIgnoreCase("jpg") || formatName.equalsIgnoreCase("jpeg")) {
        JPEGImageWriter imageWriter = (JPEGImageWriter) ImageIO.getImageWritersBySuffix(formatName).next();
        ImageWriteParam writeParam = imageWriter.getDefaultWriteParam();
        ImageTypeSpecifier typeSpecifier = ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_INT_RGB);
        IIOMetadata metadata = imageWriter.getDefaultImageMetadata(typeSpecifier, writeParam);

        if (formatName.equalsIgnoreCase("jpg") || formatName.equalsIgnoreCase("jpeg")) {

            Element tree = (Element) metadata.getAsTree("javax_imageio_jpeg_image_1.0");
            Element jfif = (Element) tree.getElementsByTagName("app0JFIF").item(0);
            jfif.setAttribute("Xdensity", Integer.toString(dpi));
            jfif.setAttribute("Ydensity", Integer.toString(dpi));
            jfif.setAttribute("resUnits", "1");
            metadata.setFromTree("javax_imageio_jpeg_image_1.0", tree);
        }

        if (quality >= 0 && quality <= 1f) {

            JPEGImageWriteParam jpegParams = (JPEGImageWriteParam) imageWriter.getDefaultWriteParam();
            jpegParams.setCompressionMode(JPEGImageWriteParam.MODE_EXPLICIT);
            jpegParams.setCompressionQuality(quality);

        }

        FileOutputStream os = new FileOutputStream(targetFile);
        final ImageOutputStream stream = ImageIO.createImageOutputStream(os);

        try {
            imageWriter.setOutput(stream);
            imageWriter.write(metadata, new IIOImage(bufferedImage, null, metadata), writeParam);
        } finally {
            stream.close();
        }
    } else {
        writeBufferedImage(bufferedImage, formatName, targetFile);
    }
}
 

@Override
public void writeBufferedImage(BufferedImage bufferedImage, float quality, int dpi, String formatName, File targetFile) throws Exception {

    System.out.println("Saving " + targetFile.getPath());

    if (formatName.equalsIgnoreCase("jpg") || formatName.equalsIgnoreCase("jpeg")) {
        JPEGImageWriter imageWriter = (JPEGImageWriter) ImageIO.getImageWritersBySuffix(formatName).next();
        ImageWriteParam writeParam = imageWriter.getDefaultWriteParam();
        ImageTypeSpecifier typeSpecifier = ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_INT_RGB);
        IIOMetadata metadata = imageWriter.getDefaultImageMetadata(typeSpecifier, writeParam);

        if (formatName.equalsIgnoreCase("jpg") || formatName.equalsIgnoreCase("jpeg")) {
            Element tree = (Element) metadata.getAsTree("javax_imageio_jpeg_image_1.0");
            Element jfif = (Element) tree.getElementsByTagName("app0JFIF").item(0);
            jfif.setAttribute("Xdensity", Integer.toString(dpi));
            jfif.setAttribute("Ydensity", Integer.toString(dpi));
            jfif.setAttribute("resUnits", "1");
            metadata.setFromTree("javax_imageio_jpeg_image_1.0", tree);
        }

        if (quality >= 0 && quality <= 1f) {
            JPEGImageWriteParam jpegParams = (JPEGImageWriteParam) imageWriter.getDefaultWriteParam();
            jpegParams.setCompressionMode(JPEGImageWriteParam.MODE_EXPLICIT);
            jpegParams.setCompressionQuality(quality);
        }

        FileOutputStream os = new FileOutputStream(targetFile);
        final ImageOutputStream stream = ImageIO.createImageOutputStream(os);

        try {
            imageWriter.setOutput(stream);
            imageWriter.write(metadata, new IIOImage(bufferedImage, null, metadata), writeParam);
        } finally {
            stream.close();
        }
    } else {
        writeBufferedImage(bufferedImage, formatName, targetFile);
    }
}
 

@Override
ImageWriteParam newImageWriterParams(PdfToJpegParameters params) {
    JPEGImageWriteParam param = new JPEGImageWriteParam(writer.getLocale());
    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    param.setCompressionQuality((float) params.getQuality() / 100);
    return param;
}
 

/**
 * 缩放gif图片
 *
 * @param originalFile
 *         原图片
 * @param resizedFile
 *         缩放后的图片
 * @param newWidth
 *         宽度
 * @param quality
 *         缩放比例 (等比例)
 *
 * @throws IOException
 */
private static void resize(File originalFile, File resizedFile, int newWidth, float quality) throws IOException {
    if (quality < 0 || quality > 1) {
        throw new IllegalArgumentException("Quality has to be between 0 and 1");
    }
    ImageIcon ii = new ImageIcon(originalFile.getCanonicalPath());

    Image i = ii.getImage();
    Image resizedImage = null;
    int iWidth = i.getWidth(null);
    int iHeight = i.getHeight(null);
    if (iWidth > iHeight) {
        resizedImage = i.getScaledInstance(newWidth, (newWidth * iHeight) / iWidth, Image.SCALE_SMOOTH);
    } else {
        resizedImage = i.getScaledInstance((newWidth * iWidth) / iHeight, newWidth, Image.SCALE_SMOOTH);
    }
    // This code ensures that all the pixels in the image are loaded.
    Image temp = new ImageIcon(resizedImage).getImage();
    // Create the buffered image.
    BufferedImage bufferedImage = new BufferedImage(temp.getWidth(null), temp.getHeight(null), BufferedImage.TYPE_INT_RGB);
    // Copy image to buffered image.
    Graphics g = bufferedImage.createGraphics();
    // Clear background and paint the image.
    g.setColor(Color.white);
    g.fillRect(0, 0, temp.getWidth(null), temp.getHeight(null));
    g.drawImage(temp, 0, 0, null);
    g.dispose();
    // Soften.
    float softenFactor = 0.05f;
    float[] softenArray = {0, softenFactor, 0, softenFactor, 1 - (softenFactor * 4), softenFactor, 0, softenFactor, 0};
    Kernel kernel = new Kernel(3, 3, softenArray);
    ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
    bufferedImage = cOp.filter(bufferedImage, null);
    // Write the jpeg to a file.
    try (
            FileOutputStream out = new FileOutputStream(resizedFile)) {

        ImageWriter imageWriter = ImageIO.getImageWritersBySuffix("jpg").next();
        ImageOutputStream ios = ImageIO.createImageOutputStream(out);
        imageWriter.setOutput(ios);
        //and metadata
        IIOMetadata imageMetaData = imageWriter.getDefaultImageMetadata(new ImageTypeSpecifier(bufferedImage), null);

        JPEGImageWriteParam jpegParams = (JPEGImageWriteParam) imageWriter.getDefaultWriteParam();
        jpegParams.setCompressionMode(JPEGImageWriteParam.MODE_EXPLICIT);
        jpegParams.setCompressionQuality(quality);
        imageWriter.write(imageMetaData, new IIOImage(bufferedImage, null, null), jpegParams);
    }
}
 

private static void encodeImageToJPEGStream(BufferedImage image, float quality, int dpi,
                                            OutputStream out) throws IOException
{
    // encode to JPEG
    ImageOutputStream ios = null;
    ImageWriter imageWriter = null;
    try
    {
        // find JAI writer
        imageWriter = getJPEGImageWriter();
        ios = ImageIO.createImageOutputStream(out);
        imageWriter.setOutput(ios);

        // add compression
        JPEGImageWriteParam jpegParam = (JPEGImageWriteParam)imageWriter.getDefaultWriteParam();
        jpegParam.setCompressionMode(JPEGImageWriteParam.MODE_EXPLICIT);
        jpegParam.setCompressionQuality(quality);

        // add metadata
        ImageTypeSpecifier imageTypeSpecifier = new ImageTypeSpecifier(image);
        IIOMetadata data = imageWriter.getDefaultImageMetadata(imageTypeSpecifier, jpegParam);
        Element tree = (Element)data.getAsTree("javax_imageio_jpeg_image_1.0");
        Element jfif = (Element)tree.getElementsByTagName("app0JFIF").item(0);
        jfif.setAttribute("Xdensity", Integer.toString(dpi));
        jfif.setAttribute("Ydensity", Integer.toString(dpi));
        jfif.setAttribute("resUnits", "1"); // 1 = dots/inch

        // write
        imageWriter.write(data, new IIOImage(image, null, null), jpegParam);
    }
    finally
    {
        // clean up
        IOUtils.closeQuietly(out);
        if (ios != null)
        {
            ios.close();
        }
        if (imageWriter != null)
        {
            imageWriter.dispose();
        }
    }
}
 

private void runInternal(final String[] args) throws IOException {
  handleCommandLineArgs(args);
  JOptionPane.showMessageDialog(
      null,
      new JLabel(
          "<html>"
              + "This is the ImageShrinker, it will create a smallMap.jpeg file for you. "
              + "<br>Put in your base map or relief map, and it will spit out a small "
              + "scaled copy of it."
              + "<br>Please note that the quality of the image will be worse than if you use a "
              + "real painting program."
              + "<br>So we suggest you instead shrink the image with paint.net or photoshop or "
              + "gimp, etc, then clean it up before saving."
              + "</html>"));
  final File mapFile =
      new FileOpen("Select The Large Image", mapFolderLocation, ".gif", ".png").getFile();
  if (mapFile == null || !mapFile.exists()) {
    throw new IllegalStateException(mapFile + "File does not exist");
  }
  if (mapFolderLocation == null) {
    mapFolderLocation = mapFile.getParentFile();
  }
  final String input = JOptionPane.showInputDialog(null, "Select scale");
  final float scale = Float.parseFloat(input);
  final Image baseImg = ImageIO.read(mapFile);
  final int thumbWidth = (int) (baseImg.getWidth(null) * scale);
  final int thumbHeight = (int) (baseImg.getHeight(null) * scale);
  // based on code from
  // http://www.geocities.com/marcoschmidt.geo/java-save-jpeg-thumbnail.html
  // draw original image to thumbnail image object and scale it to the new size on-the-fly
  final BufferedImage thumbImage =
      new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
  final Graphics2D graphics2D = thumbImage.createGraphics();
  graphics2D.setRenderingHint(
      RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
  graphics2D.drawImage(baseImg, 0, 0, thumbWidth, thumbHeight, null);
  // save thumbnail image to OUTFILE
  final File file =
      new File(new File(mapFile.getPath()).getParent() + File.separatorChar + "smallMap.jpeg");
  try (ImageOutputStream out = new FileImageOutputStream(file)) {
    final ImageWriter encoder = ImageIO.getImageWritersByFormatName("JPEG").next();
    final JPEGImageWriteParam param = new JPEGImageWriteParam(null);
    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    param.setCompressionQuality((float) 1.0);
    encoder.setOutput(out);
    encoder.write(null, new IIOImage(thumbImage, null, null), param);
  }
  log.info("Image successfully written to " + file.getPath());
}
 

/**
 * Takes an image and creates an optimized version of it.
 *
 * If the image is larger than maxWidthOrHeight pixels, it is downsized to fit the maxWidthOrHeight rectangle (keeping its aspect ratio). Image is saved as JPEG with specified
 * quality (1.0 is best/leave unchanged, 0.0 is worst). Image DPI is changed to dpi specified.
 */
public static File optimize(BufferedImage bufferedImage, float quality, int dpi, int width, int height,
        boolean gray) throws IOException {
    long start = System.currentTimeMillis();
    File outputFile = File.createTempFile("pdfimage", ".jpeg");
    outputFile.deleteOnExit();

    try {
        int relevantDelta = 20;
        boolean isResizeRelevant = Math.abs(bufferedImage.getWidth() - width) > relevantDelta
                && Math.abs(bufferedImage.getHeight() - height) > relevantDelta;
        boolean isShirinking = bufferedImage.getHeight() > height || bufferedImage.getWidth() > width;

        if (isResizeRelevant && isShirinking) {
            // we resize down, we don't resize up
            LOG.debug("Resizing image from {}x{} to {}x{}", bufferedImage.getWidth(), bufferedImage.getHeight(),
                    width, height);
            bufferedImage = Scalr.resize(bufferedImage, Scalr.Method.BALANCED, width, height);
        }

        // PNG read fix when converting to JPEG
        BufferedImage newImage = new BufferedImage(bufferedImage.getWidth(), bufferedImage.getHeight(),
                gray ? BufferedImage.TYPE_BYTE_GRAY : BufferedImage.TYPE_INT_RGB);

        Graphics2D g2d = newImage.createGraphics();
        g2d.drawImage(bufferedImage, 0, 0, Color.WHITE, null);
        g2d.dispose();

        ImageWriter imageWriter = ImageIO.getImageWritersBySuffix("jpeg").next();
        ImageOutputStream ios = ImageIO.createImageOutputStream(outputFile);
        imageWriter.setOutput(ios);

        // compression
        JPEGImageWriteParam jpegParams = (JPEGImageWriteParam) imageWriter.getDefaultWriteParam();
        jpegParams.setCompressionMode(JPEGImageWriteParam.MODE_EXPLICIT);
        jpegParams.setCompressionQuality(quality);

        IIOMetadata imageMetaData = null;
        try {
            // new metadata
            imageMetaData = imageWriter.getDefaultImageMetadata(new ImageTypeSpecifier(newImage), jpegParams);
            Element tree = (Element) imageMetaData.getAsTree("javax_imageio_jpeg_image_1.0");
            Element jfif = (Element) tree.getElementsByTagName("app0JFIF").item(0);
            jfif.setAttribute("Xdensity", Integer.toString(dpi));
            jfif.setAttribute("Ydensity", Integer.toString(dpi));
            jfif.setAttribute("resUnits", "1");
            imageMetaData.setFromTree("javax_imageio_jpeg_image_1.0", tree);
        } catch (Exception e) {
            LOG.warn("Failed to set DPI for image, metadata manipulation failed", e);
        }

        try {
            imageWriter.write(null, new IIOImage(newImage, null, imageMetaData), jpegParams);
        } finally {
            IOUtils.closeQuietly(ios);
            imageWriter.dispose();
        }

        return outputFile;
    } finally {
        bufferedImage.flush();
        long elapsed = System.currentTimeMillis() - start;
        if (elapsed > 500)
            LOG.trace("Optimizing image took " + elapsed + "ms");
    }
}