Example usage for javax.imageio ImageWriter getDefaultImageMetadata

Introduction

In this page you can find the example usage for javax.imageio ImageWriter getDefaultImageMetadata.

Prototype

public abstract IIOMetadata getDefaultImageMetadata(ImageTypeSpecifier imageType, ImageWriteParam param);

Source Link

Document

Returns an IIOMetadata object containing default values for encoding an image of the given type.

Usage

From source file:org.photovault.imginfo.CreateCopyImageCommand.java

/**
 Helper function to save a rendered image to file
 @param instanceFile The file into which the image will be saved
 @param img Image that willb e saved// ww  w.  ja  v a 2 s . c  o m
 @param xmpData XPM metadata packet that should be saved with the image
 @throws PhotovaultException if saving does not succeed
 */
protected void saveImage(File instanceFile, RenderedImage img, byte[] xmpData) throws PhotovaultException {
    ImageOutputStream out = null;
    log.debug("Entry: saveImage, file = " + instanceFile.getAbsolutePath());
    try {
        out = new FileImageOutputStream(instanceFile);
    } catch (IOException e) {
        log.error("Error writing image: " + e.getMessage());
        throw new PhotovaultException(e.getMessage());
    }
    if (img.getSampleModel().getSampleSize(0) == 16) {
        log.debug("16 bit image, converting to 8 bits");
        double[] subtract = new double[1];
        subtract[0] = 0;
        double[] divide = new double[1];
        divide[0] = 1. / 256.;
        // Now we can rescale the pixels gray levels:
        ParameterBlock pbRescale = new ParameterBlock();
        pbRescale.add(divide);
        pbRescale.add(subtract);
        pbRescale.addSource(img);
        PlanarImage outputImage = (PlanarImage) JAI.create("rescale", pbRescale, null);
        // Make sure it is a byte image - force conversion.
        ParameterBlock pbConvert = new ParameterBlock();
        pbConvert.addSource(outputImage);
        pbConvert.add(DataBuffer.TYPE_BYTE);
        img = JAI.create("format", pbConvert);
    }

    IIOImage iioimg = new IIOImage(img, null, null);

    /*
     Not all encoders support metadata handling
     */
    Iterator writers = ImageIO.getImageWritersByFormatName("jpeg");
    ImageWriter imgwriter = null;
    while (writers.hasNext()) {
        imgwriter = (ImageWriter) writers.next();
        if (imgwriter.getClass().getName().endsWith("JPEGImageEncoder")) {
            // Break on finding the core provider.
            break;
        }
    }
    if (imgwriter == null) {
        System.err.println("Cannot find core JPEG writer!");
    }
    imgwriter.addIIOWriteWarningListener(new IIOWriteWarningListener() {

        public void warningOccurred(ImageWriter arg0, int arg1, String arg2) {
            log.warn("Warning from ImageWriter: " + arg2);
        }
    });
    ImageWriteParam params = imgwriter.getDefaultWriteParam();
    ImageTypeSpecifier its = ImageTypeSpecifier.createFromRenderedImage(img);
    IIOMetadata metadata = imgwriter.getDefaultImageMetadata(its, null);

    IIOMetadataNode metatop = (IIOMetadataNode) metadata.getAsTree("javax_imageio_jpeg_image_1.0");
    NodeList markerSeqNodes = metatop.getElementsByTagName("markerSequence");
    if (markerSeqNodes.getLength() > 0) {
        IIOMetadataNode xmpNode = new IIOMetadataNode("unknown");
        xmpNode.setAttribute("MarkerTag", "225");
        xmpNode.setUserObject(xmpData);
        markerSeqNodes.item(0).appendChild(xmpNode);
    }

    try {
        metadata.setFromTree("javax_imageio_jpeg_image_1.0", metatop);
    } catch (Exception e) {
        log.warn("error editing metadata: " + e.getMessage());
        e.printStackTrace();
        throw new PhotovaultException("error setting image metadata: \n" + e.getMessage());
    }

    iioimg.setMetadata(metadata);

    try {
        imgwriter.setOutput(out);
        imgwriter.write(iioimg);
    } catch (IOException e) {
        log.warn("Exception while encoding" + e.getMessage());
        throw new PhotovaultException(
                "Error writing instance " + instanceFile.getAbsolutePath() + ": " + e.getMessage());
    } finally {
        try {
            out.close();
        } catch (IOException e) {
            log.warn("Exception while closing file: " + e.getMessage());
            imgwriter.dispose();
            throw new PhotovaultException(
                    "Error writing instance " + instanceFile.getAbsolutePath() + ": " + e.getMessage());

        }
        imgwriter.dispose();
    }
    log.debug("Exit: saveImage");
}

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From source file:org.sejda.sambox.pdmodel.graphics.image.JPEGFactory.java

private static void encodeImageToJPEGStream(BufferedImage image, float quality, int dpi, OutputStream out)
        throws IOException {
    // encode to JPEG
    ImageOutputStream ios = null;
    ImageWriter imageWriter = null;
    try {// w w  w.ja  v a2  s  .c o  m
        // find JAI writer
        imageWriter = ImageIO.getImageWritersBySuffix("jpeg").next();
        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();
        }
    }
}

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