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Soft Light by Photoshop's formula; stacks, coverage and adjustments in every mode proven (13.9a)

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ZacharyZhang-NY committed 2026-10-01 17:47:52 -04:00
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commit 06843364fe
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tests/BlendModeTests.cpp
+3 -4
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@@ -70,11 +70,10 @@ Rgb reference(LayerBlendMode mode, const Rgb &backdrop, const Rgb &source)
case LayerBlendMode::multiply: result[channel] = b * s; break;
case LayerBlendMode::screen: result[channel] = b + s - b * s; break;
case LayerBlendMode::overlay: result[channel] = hardLight(s, b); break;
case LayerBlendMode::softLight: {
const double d = b <= 0.25 ? ((16 * b - 12) * b + 4) * b : std::sqrt(b);
result[channel] = s <= 0.5 ? b - (1 - 2 * s) * b * (1 - b) : b + (2 * s - 1) * (d - b);
// Photoshop's, as Core Image computes it (Compositor 1.4).
case LayerBlendMode::softLight:
result[channel] = s <= 0.5 ? 2 * b * s + b * b * (1 - 2 * s) : 2 * b * (1 - s) + std::sqrt(b) * (2 * s - 1);
break;
}
case LayerBlendMode::darken: result[channel] = std::min(b, s); break;
case LayerBlendMode::lighten: result[channel] = std::max(b, s); break;
case LayerBlendMode::difference: result[channel] = std::abs(b - s); break;