Examples of javax.imageio.plugins.jpeg.JPEGImageWriteParam

javax.imageio.plugins.jpeg.JPEGImageWriteParam
This class adds the ability to set JPEG quantization and Huffman tables when using the built-in JPEG writer plug-in, and to request that optimized Huffman tables be computed for an image. An instance of this class will be returned from the getDefaultImageWriteParam methods of the built-in JPEG ImageWriter.
The principal purpose of these additions is to allow the specification of tables to use in encoding abbreviated streams. The built-in JPEG writer will also accept an ordinary ImageWriteParam, in which case the writer will construct the necessary tables internally.
In either case, the quality setting in an ImageWriteParam has the same meaning as for the underlying library: 1.00 means a quantization table of all 1's, 0.75 means the "standard", visually lossless quantization table, and 0.00 means aquantization table of all 255's.
While tables for abbreviated streams are often specified by first writing an abbreviated stream containing only the tables, in some applications the tables are fixed ahead of time. This class allows the tables to be specified directly from client code.
Normally, the tables are specified in the IIOMetadata objects passed in to the writer, and any tables included in these objects are written to the stream. If no tables are specified in the metadata, then an abbreviated stream is written. If no tables are included in the metadata and no tables are specified in a JPEGImageWriteParam, then an abbreviated stream is encoded using the "standard" visually lossless tables. This class is necessary for specifying tables when an abbreviated stream must be written without writing any tables to a stream first. In order to use this class, the metadata object passed into the writer must contain no tables, and no stream metadata must be provided. See {@link JPEGQTable JPEGQTable} and{@link JPEGHuffmanTable JPEGHuffmanTable} for moreinformation on the default tables.
The default JPEGImageWriteParam returned by the getDefaultWriteParam method of the writer contains no tables. Default tables are included in the default IIOMetadata objects returned by the writer.
If the metadata does contain tables, the tables given in a JPEGImageWriteParam are ignored. Furthermore, once a set of tables has been written, only tables in the metadata can override them for subsequent writes, whether to the same stream or a different one. In order to specify new tables using this class, the {@link javax.imageio.ImageWriter#reset reset}method of the writer must be called.
For more information about the operation of the built-in JPEG plug-ins, see the JPEG metadata format specification and usage notes.

      // prepare output file
      ios = ImageIO.createImageOutputStream(new File(fileName));
      writer.setOutput(ios);


      // set the quality
      param = new JPEGImageWriteParam(Locale.getDefault());
      param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT) ;
      param.setCompressionQuality(1.0f);


      // write the image
      writer.write(null, new IIOImage(bi, null, null), param);

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    // prepare output file
    ios = ImageIO.createImageOutputStream(getFile());
    writer.setOutput(ios);


    // set the quality
    param = new JPEGImageWriteParam(Locale.getDefault());
    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT) ;
    param.setCompressionQuality(getQuality());


    // write the image
    writer.write(null, new IIOImage(bi, null, null), param);

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   *            image quality
   */
  public static void saveImageToJPEGFile14(BufferedImage bi, File file,
      float quality) throws IOException {


    JPEGImageWriteParam param = new JPEGImageWriteParam(null);
    ImageTypeSpecifier type = new ImageTypeSpecifier(bi);
    param.setDestinationType(type);
    ImageOutputStream imgos = ImageIO.createImageOutputStream(file);
    Iterator writers = ImageIO.getImageWritersByFormatName("jpeg");
    ImageWriter writer = (ImageWriter) writers.next();
    writer.setOutput(imgos);
    writer.write(bi);

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        iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        iwp.setCompressionType(compression); // Lossy compression.
        iwp.setCompressionQuality(compressionRate); // We can control quality here.
        if (iwp instanceof JPEGImageWriteParam) {
            final JPEGImageWriteParam param = (JPEGImageWriteParam) iwp;
            param.setOptimizeHuffmanTables(true);
            try {
                param.setProgressiveMode(JPEGImageWriteParam.MODE_DEFAULT);
            } catch (UnsupportedOperationException e) {
                throw new IOException(e);
            }
        }

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                Graphics2D g3 = scaled.createGraphics();
                g3.drawImage(img, 0, 0, img.getWidth(null), img.getHeight(null), null);
                g3.dispose();


                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                ImageWriteParam iwparam = new JPEGImageWriteParam(Locale.getDefault());
                iwparam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
                iwparam.setCompressionQuality(jpegQuality);//Set here your compression rate
                ImageWriter iw = ImageIO.getImageWritersByFormatName("jpg").next();
                ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
                iw.setOutput(ios);
                iw.write(null, new IIOImage(scaled, null, null), iwparam);
                iw.dispose();

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        BufferedImage img = (BufferedImage)image.getRenderedImage();
        cli.System.Drawing.Bitmap bitmap = img.getBitmap();
        
        ImageOutputStream imgOutput = (ImageOutputStream)getOutput();
        
        JPEGImageWriteParam jparam = null;
        JPEGQTable[] qTables = null;
        
        if (param != null) {
            switch (param.getCompressionMode()) {
                case ImageWriteParam.MODE_DISABLED:
                    throw new IIOException("JPEG compression cannot be disabled");
                case ImageWriteParam.MODE_EXPLICIT:
                    float quality = param.getCompressionQuality();
                    quality = JPEG.convertToLinearQuality(quality);
                    qTables = new JPEGQTable[2];
                    qTables[0] = JPEGQTable.K1Luminance.getScaledInstance(quality, true);
                    qTables[1] = JPEGQTable.K2Chrominance.getScaledInstance(quality, true);
                    break;
                case ImageWriteParam.MODE_DEFAULT:
                    qTables = new JPEGQTable[2];
                    qTables[0] = JPEGQTable.K1Div2Luminance;
                    qTables[1] = JPEGQTable.K2Div2Chrominance;
                    break;
            }
            if (param instanceof JPEGImageWriteParam) {
                jparam = (JPEGImageWriteParam)param;
            }
        }
        
        if (qTables == null) {
            if (jparam != null && jparam.areTablesSet()) {
                qTables = jparam.getQTables();
            } else {
                qTables = JPEG.getDefaultQTables();
            }
        }

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    /**
     * {@inheritDoc}
     */
    @Override
    public ImageWriteParam getDefaultWriteParam() {
        return new JPEGImageWriteParam(null);
    }

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            writer = (ImageWriter) iter.next();
            if (file.exists())
                file.delete();
            ImageOutputStream ios = ImageIO.createImageOutputStream(file);
            writer.setOutput(ios);
            JPEGImageWriteParam iwp = new JPEGImageWriteParam(null);
            iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
            iwp.setCompressionQuality(quality);
            writer.write(null, new IIOImage(image, null, null), iwp);
            ios.flush();
            writer.dispose();
            ios.close();
        }

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        BufferedImage bi = makeBufferedImage( img );


        if ( type == ImageType.JPG ) {


            ImageWriter encoder = ImageIO.getImageWritersByFormatName("JPEG").next(); //NON-NLS
            JPEGImageWriteParam param = new JPEGImageWriteParam(null);


            param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
            encoder.setOutput(out);


            try {
                encoder.write(null, new IIOImage((RenderedImage)img, null, null), param);
            } catch (IOException fne) {

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        if(this.JPEGParam == null) {
            if(param != null && param instanceof JPEGImageWriteParam) {
                JPEGParam = (JPEGImageWriteParam)param;
            } else {
                JPEGParam =
                    new JPEGImageWriteParam(writer != null ?
                                            writer.getLocale() : null);
                if(param.getCompressionMode() ==
                   ImageWriteParam.MODE_EXPLICIT) {
                    JPEGParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
                    JPEGParam.setCompressionQuality(param.getCompressionQuality());

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