Dithering Images - OpenRCT2/OpenRCT2 GitHub Wiki
When making realistic looking sprites or large images for use with OpenRCT2, dithering is the best solution.
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No palette:
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RCT2 palette, no dithering:
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RCT2 palette, dithering:
To dither images for OpenRCT2, two general approaches can be taken.
Dithering images automatically
The sprite compiler that converts images to be used in game has options to automatically dither the images. For more information see Sprite compiler.
Dithering images with an external tool
Images processed with an external tool will not be affected by any of the sprite compiler modes. If you want more freedom over the way an image looks, you can use an external tool.