Fix Image::ColorToGray()
Previous implementation had images brighter than usual. The algorithm used was probably not necessary as it was for converting from linear-space to a different one.
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@ -355,11 +355,7 @@ uint8_t Image::ColorToGray(uint8_t red, uint8_t green, uint8_t blue) {
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double y_linear = 0.2126 * (red / 255.0) + 0.7152 * (green / 255.0) +
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0.0722 * (blue / 255.0);
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if (y_linear <= 0.0031308) {
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return std::round((12.92 * y_linear) * 255.0);
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} else {
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return std::round((1.055 * std::pow(y_linear, 1 / 2.4) - 0.055) * 255.0);
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}
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return std::round(y_linear * 255.0);
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}
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std::unique_ptr<Image> Image::ToGrayscale() const {
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