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experiment(render): revert BLUE shift; warm WHITE palette to (255,248,230)
CI / test (push) Has been cancelled
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#5 (BLUE → [8,32,220]) made sky map to WHITE which dithered greenish.
Reverting BLUE to baseline (24,64,192).

#6: warm WHITE from (245,245,240) → (255,248,230). Slight cream shift
pulls warm-toned skin pixels toward WHITE in the nearest-color match
before error diffusion has a chance to drift them toward BLUE. Sky
mapping unchanged (still maps to BLUE). Cost: real off-white pixels
might quantize toward a slightly warmer cream — should be subtle.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Matt Edholm
2026-05-14 14:07:24 -04:00
parent 324f1b2641
commit 89ba3515ac
1 changed files with 8 additions and 6 deletions
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src/MessageHandler/RenderImageMessageHandler.php
+8 -6
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@@ -21,20 +21,22 @@ final class RenderImageMessageHandler
/** /**
* Waveshare Spectra 6 palette. Values are the dither's *mapping targets* — * Waveshare Spectra 6 palette. Values are the dither's *mapping targets* —
* panel still displays each nibble as its actual ink colour regardless of * panel still displays each nibble as its actual ink colour regardless of
* what RGB we tell the algorithm. Shifting BLUE further from neutral pulls * what RGB we tell the algorithm.
* borderline-bluish pixels (sky cast on skin) toward RED/WHITE/YELLOW.
* *
* Baseline (frozen at render-baseline-2026-05-14): * Baseline (frozen at render-baseline-2026-05-14):
* 0x1 WHITE = [245, 245, 240]
* 0x5 BLUE = [24, 64, 192] * 0x5 BLUE = [24, 64, 192]
* Experiment #5: * Experiment #5 (BLUE → [8, 32, 220]) — made sky greenish, reverted.
* 0x5 BLUE = [ 8, 32, 220] — more saturated mapping target. * Experiment #6 (WHITE → [255, 248, 230]) — warmer cream pulls warm
* skin pixels toward WHITE before error diffusion can drift them
* toward BLUE, without changing how sky maps.
*/ */
public const PALETTE = [ public const PALETTE = [
0x0 => [26, 26, 26 ], // BLACK 0x0 => [26, 26, 26 ], // BLACK
0x1 => [245, 245, 240], // WHITE 0x1 => [255, 248, 230], // WHITE (warmed in experiment #6)
0x2 => [240, 208, 0 ], // YELLOW 0x2 => [240, 208, 0 ], // YELLOW
0x3 => [192, 48, 32 ], // RED 0x3 => [192, 48, 32 ], // RED
0x5 => [8, 32, 220], // BLUE (shifted in experiment #5) 0x5 => [24, 64, 192], // BLUE
0x6 => [16, 160, 64 ], // GREEN 0x6 => [16, 160, 64 ], // GREEN
]; ];