IndexColorModel : Java Glossary

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IndexColorModel
IndexColorModel lets you encode images in 1/4 the space of images encoded with 32-bit colours. The catch is, you must compose your image from a maxium of 256 colours. That way each pixel can be encoded in 8-bits as an index into the colour map (aka palette) to find the corresponding 32-bit colour. Here is how you use it:
Here in what the png file it creates looks like:
IndexColorModel sample png

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