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LibGfx/Color: Use luminosity to compute grayscale value

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Issue #9758 discusses this.
This commit is contained in:
Mustafa Quraish 2021-09-02 17:50:06 -04:00 • committed by Andreas Kling
parent ca6c9be94c
commit 882d57326c
1 changed files with 6 additions and 1 deletions
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7
Userland/Libraries/LibGfx/Color.h
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@ -221,9 +221,14 @@ public:
alpha() * other.alpha() / 255); alpha() * other.alpha() / 255);
} }
constexpr u8 luminosity() const
{
return (red() * 0.2126f + green() * 0.7152f + blue() * 0.0722f);
}
constexpr Color to_grayscale() const constexpr Color to_grayscale() const
{ {
int gray = (red() + green() + blue()) / 3; auto gray = luminosity();
return Color(gray, gray, gray, alpha()); return Color(gray, gray, gray, alpha());
} }