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L*a*b* regions: some code cleanups

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This commit is contained in:
Alberto Griggio
2018-11-01 13:34:10 +01:00
parent be03d1061a
commit e9f0b6ac60
2 changed files with 26 additions and 24 deletions
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6
rtengine/iplabregions.cc
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@@ -75,9 +75,11 @@ void ImProcFunctions::labColorCorrectionRegions(LabImage *lab)
float b = lab->b[y][x];
float c, h;
Color::Lab2Lch(a, b, c, h);
float c1 = lin2log(c * (327.68f / 48000.f), 10.f);
// magic constant c_factor: normally chromaticity is in [0; 42000] (see color.h), but here we use the constant to match how the chromaticity pipette works (see improcfun.cc lines 4705-4706 and color.cc line 1930
constexpr float c_factor = 327.68f / 48000.f;
float c1 = lin2log(c * c_factor, 10.f);
float h1 = Color::huelab_to_huehsv2(h);
h1 = h1 + 1.f/6.f;
h1 = h1 + 1.f/6.f; // offset the hue because we start from purple instead of red
if (h1 > 1.f) {
h1 -= 1.f;
}