Getting the Transparent Pixel and Number of Colors Used in a GIF Image
A IndexColorModel is used to represent the color table of a GIF
image.
// Get GIF image
Image image = new ImageIcon("image.gif").getImage();
// Get the color model; this method is implemented in
// Getting the Color Model of an Image
IndexColorModel colorModel = (IndexColorModel)getColorModel(image);
// Get transparent pixel
int trans = colorModel.getTransparentPixel();
if (trans == -1) {
// There is no transparent pixel
}
// Get the number of colors
int numColors = colorModel.getMapSize();
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