diff options
| -rw-r--r-- | libdimension/color.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/libdimension/color.c b/libdimension/color.c index abda9bb..6555578 100644 --- a/libdimension/color.c +++ b/libdimension/color.c @@ -298,6 +298,14 @@ dmnsn_sRGB_from_color(dmnsn_color color) return sRGB; } +static double +dmnsn_color_intensity(dmnsn_color color) +{ + dmnsn_sRGB sRGB = dmnsn_sRGB_from_color(color); + return 0.2126198631048975*sRGB.R + 0.7151387878413206*sRGB.G + + 0.0721499433963131*sRGB.B; +} + /* Add two colors */ dmnsn_color dmnsn_color_add(dmnsn_color c1, dmnsn_color c2) @@ -314,10 +322,8 @@ dmnsn_color_add(dmnsn_color c1, dmnsn_color c2) dmnsn_color ret = dmnsn_color_from_sRGB(sRGB); /* Weighted average of transparencies by intensity */ - dmnsn_CIE_Lab Lab1 = dmnsn_Lab_from_color(c1, dmnsn_whitepoint); - dmnsn_CIE_Lab Lab2 = dmnsn_Lab_from_color(c2, dmnsn_whitepoint); - double L1 = Lab1.L*(1.0 - c1.filter - c1.trans); - double L2 = Lab2.L*(1.0 - c2.filter - c2.trans); + double L1 = dmnsn_color_intensity(c1)*(1.0 - c1.filter - c1.trans); + double L2 = dmnsn_color_intensity(c2)*(1.0 - c2.filter - c2.trans); if (L1 + L2) { ret.filter = (L1*c1.filter + L2*c2.filter)/(L1 + L2); ret.trans = (L1*c1.trans + L2*c2.trans) /(L1 + L2); |