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Revert quantization to original crosspoint values

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jpirnay
2026-04-10 14:41:29 +02:00
parent 667cde91f5
commit f71d7a66e8
1 changed files with 6 additions and 3 deletions
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lib/GfxRenderer/BitmapHelpers.cpp
+6 -3
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@@ -54,11 +54,14 @@ int adjustPixel(int gray) {
} }
// Simple quantization without dithering — evenly-spaced midpoint thresholds for factory LUT // Simple quantization without dithering — evenly-spaced midpoint thresholds for factory LUT
uint8_t quantizeSimple(int gray) { uint8_t quantizeSimple(int gray) {
if (gray < 43) { // Midpoint thresholds for 4 levels would be: 0-63=0, 64-127=1, 128-191=2, 192-255=3
// Crosspoint thresholds for 4 levels: 0-44=0, 45-69=1, 70-139=2, 140-255=3
// (slightly brighter to compensate for quantization)
if (gray < 45) {
return 0; return 0;
} else if (gray < 128) { } else if (gray < 70) {
return 1; return 1;
} else if (gray < 213) { } else if (gray < 140) {
return 2; return 2;
} else { } else {
return 3; return 3;