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fix(avatar): rank png row filters by magnitude rather than by sign master

The heuristic added 128 to every residual before taking the smaller of it and its negation, so a residual of +1 scored worse than one of -3 and the encoder took the worse filter whenever a row ran lighter than the one above it. Sixty avatars drawn from the bundled styles come to 2.6% fewer bytes. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author permadeath.com Co-author Claude Opus 5 (1M context) Committer Tangled Date Commit d8ececca Parent 8735cf0e
+26 -2
1 changed file