This artificial test image (from the Dava engine) is tough for PVRTC. Left is original, middle is my encoding (44.3 Y dB), right is PVRTexTool (37.89). Those artifacts on the 1 and 0 are so annoying.pic.twitter.com/S3dyfLod4e
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PVRTC is a frustratingly fiddly format to encode. PVRTexTool's encoder has been (apparently) tuned to avoid a type of artifact I've nicknamed "local modulation flips". I'm trying to find a solution - so far no luck.
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