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| -rw-r--r-- | gui/ThemeModern.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gui/ThemeModern.cpp b/gui/ThemeModern.cpp index 9b7df9ed59..8452c8a37d 100644 --- a/gui/ThemeModern.cpp +++ b/gui/ThemeModern.cpp @@ -1454,6 +1454,10 @@ OverlayColor ThemeModern::calcLuminance(OverlayColor col) { uint8 r, g, b; _system->colorToRGB(col, r, g, b); + // A better (but slower) formula to calculate the luminance would be: + //uint lum = (byte)((0.299 * r + 0.587 * g + 0.114 * b) + 0.5); + // Note that the approximation below will only produce values between + // (and including) 0 and 221. uint lum = (r >> 2) + (g >> 1) + (b >> 3); return _system->RGBToColor(lum, lum, lum); |