private RenderedImage forceComponentColorModel(RenderedImage image) {
final IndexColorModel icm = (IndexColorModel) image.getColorModel();
final SampleModel sm = image.getSampleModel();
final int datatype = sm.getDataType();
final boolean alpha = icm.hasAlpha();
// Definition of the lookup table
final int numDestinationBands = 4;
LookupTableJAI lut = null;
final byte data[][] = new byte[numDestinationBands][icm.getMapSize()];
icm.getReds(data[0]);
icm.getGreens(data[1]);
icm.getBlues(data[2]);
icm.getAlphas(data[3]);
lut = new LookupTableJAI(data);
// Layout creation
final ImageLayout layout = new ImageLayout(image);
final RenderingHints hints = new RenderingHints(JAI.KEY_IMAGE_LAYOUT, layout);
int[] bits = new int[numDestinationBands];
// bits per component
for (int i = 0; i < numDestinationBands; i++) bits[i] = sm.getSampleSize(i);
final ComponentColorModel destinationColorModel =
new ComponentColorModel(
ColorSpace.getInstance(ColorSpace.CS_sRGB),
bits,
alpha,
image.getColorModel().isAlphaPremultiplied(),
alpha ? Transparency.TRANSLUCENT : Transparency.OPAQUE,
datatype);
final SampleModel destinationSampleModel =
destinationColorModel.createCompatibleSampleModel(image.getWidth(), image.getHeight());
layout.setColorModel(destinationColorModel);
layout.setSampleModel(destinationSampleModel);
// Lookup Operations
image =
LookupDescriptor.create(image, new LookupTableWrapper(lut), 0, null, null, false, hints);
return image;
}
protected RenderedImage convert(RenderedImage renderedImage) throws Exception {
int height = renderedImage.getHeight();
int width = renderedImage.getWidth();
SampleModel sampleModel = renderedImage.getSampleModel();
ColorModel colorModel = renderedImage.getColorModel();
Raster raster = renderedImage.getData();
DataBuffer dataBuffer = raster.getDataBuffer();
if (colorModel instanceof IndexColorModel) {
IndexColorModel indexColorModel = (IndexColorModel) colorModel;
int mapSize = indexColorModel.getMapSize();
byte[][] data = new byte[4][mapSize];
indexColorModel.getReds(data[0]);
indexColorModel.getGreens(data[1]);
indexColorModel.getBlues(data[2]);
indexColorModel.getAlphas(data[3]);
LookupTableJAI lookupTableJAI = new LookupTableJAI(data);
renderedImage = LookupDescriptor.create(renderedImage, lookupTableJAI, null);
} else if (sampleModel.getNumBands() == 2) {
List<Byte> bytesList = new ArrayList<Byte>(height * width * _NUM_OF_BANDS);
List<Byte> tempBytesList = new ArrayList<Byte>(_NUM_OF_BANDS);
for (int i = 0; i < dataBuffer.getSize(); i++) {
int mod = (i + 1) % 2;
int elemPos = i;
if (mod == 0) {
tempBytesList.add((byte) dataBuffer.getElem(elemPos - 1));
tempBytesList.add((byte) dataBuffer.getElem(elemPos - 1));
}
tempBytesList.add((byte) dataBuffer.getElem(elemPos));
if (mod == 0) {
Collections.reverse(tempBytesList);
bytesList.addAll(tempBytesList);
tempBytesList.clear();
}
}
byte[] data = ArrayUtil.toArray(bytesList.toArray(new Byte[bytesList.size()]));
DataBuffer newDataBuffer = new DataBufferByte(data, data.length);
renderedImage = createRenderedImage(renderedImage, height, width, newDataBuffer);
} else if (colorModel.getTransparency() != Transparency.TRANSLUCENT) {
List<Byte> bytesList = new ArrayList<Byte>(height * width * _NUM_OF_BANDS);
List<Byte> tempBytesList = new ArrayList<Byte>(_NUM_OF_BANDS);
for (int i = 0; i < dataBuffer.getSize(); i++) {
int mod = (i + 1) % 3;
int elemPos = i;
tempBytesList.add((byte) dataBuffer.getElem(elemPos));
if (mod == 0) {
tempBytesList.add((byte) 255);
Collections.reverse(tempBytesList);
bytesList.addAll(tempBytesList);
tempBytesList.clear();
}
}
byte[] data = ArrayUtil.toArray(bytesList.toArray(new Byte[bytesList.size()]));
DataBuffer newDataBuffer = new DataBufferByte(data, data.length);
renderedImage = createRenderedImage(renderedImage, height, width, newDataBuffer);
}
return renderedImage;
}
