return image;
}
private RenderedImage addAlphaChannel(RenderedImage image) {
final ImageLayout tempLayout= new ImageLayout(image);
tempLayout.unsetValid(ImageLayout.COLOR_MODEL_MASK).unsetValid(ImageLayout.SAMPLE_MODEL_MASK);
RenderedImage alpha = ConstantDescriptor.create(
Float.valueOf( image.getWidth()),
Float.valueOf(image.getHeight()),
new Byte[] { Byte.valueOf((byte) 255) },
new RenderingHints(JAI.KEY_IMAGE_LAYOUT,tempLayout));