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enhancement gamma free retinex

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Desmis
2015-09-18 17:23:44 +02:00
parent ea737ca866
commit 645791fd71
12 changed files with 175 additions and 15 deletions
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11
rtengine/color.h
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@@ -981,6 +981,17 @@ public:
{
return x <= 0.027345 ? x / 3.0 : exp(log((x + 0.012305) / 1.012305) * 1.45);
}
//gamma for Retinex
static inline double gammareti (double x, double gamma, double start, double slope, double mul, double add)
{
return (x <= start ? x*slope : exp(log(x) / gamma) * mul - add);
}
static inline double igammareti (double x, double gamma, double start, double slope, double mul, double add)
{
return (x <= start * slope ? x / slope : exp(log((x + add) / mul) * gamma) );
}
// gamma function with adjustable parameters