stephenseo/EN605.617.81.FA21_StephenSeo_DitheringProject
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Fix Image::ColorToGray()

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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.
This commit is contained in:
Stephen Seo 2021-12-04 11:40:07 +09:00
parent 750e0d07bb
commit a4d7156e10
1 changed files with 1 additions and 5 deletions
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src/image.cc
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@ -355,11 +355,7 @@ uint8_t Image::ColorToGray(uint8_t red, uint8_t green, uint8_t blue) {
double y_linear = 0.2126 * (red / 255.0) + 0.7152 * (green / 255.0) + double y_linear = 0.2126 * (red / 255.0) + 0.7152 * (green / 255.0) +
0.0722 * (blue / 255.0); 0.0722 * (blue / 255.0);
if (y_linear <= 0.0031308) { return std::round(y_linear * 255.0);
return std::round((12.92 * y_linear) * 255.0);
} else {
return std::round((1.055 * std::pow(y_linear, 1 / 2.4) - 0.055) * 255.0);
}
} }
std::unique_ptr<Image> Image::ToGrayscale() const { std::unique_ptr<Image> Image::ToGrayscale() const {