Enumerate all pixel colors used in game all game images, and then collapse all like colors into a single, small, coherent palette across all graphics.
It might seem counter-intuitive, but most computer games benefit significantly from having as few colors in the artwork as needed. A balance is needed, too few colors and it will be difficult to express all needed visual effects. However, have too many colors and your graphics will feel like they do not fit together.
Opensource and independent games suffer the most, as resources are tight, many games use open game assets created by several different artists. The different artists might have different art styles and this might manifest into the final product as graphics which feel out of place.
Simply ensuring that all game graphics utilize the same restricted palette can go a long way to mitigate this issue, making the final product feel the way it should. Utilizing a smaller palette can also help you reduce the size of your image files, making your game easier to deploy.
All you need to do is point gpu to your game images directory and specify how large you want your palette to be. gpu should be smart enough to select colors that you need and map other colors to the best color in your palette.
If the resultant images are not suitable, you can consider adjusting your palette size, or by entering manual mapping mode. In manual mapping mode, gpu will still auto-map a palette for you, but before creating a new set of artwork, gpu will allow you to adjust the choices it has made.
Note: This application works only on BMPs. If you intend to use another image format in your game, you can use ImageMagick's convert to change between image formats for the purpose of using this application, and then back to your preferred game format (assuming you are using a format supported by ImageMagick).
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