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Gamma before-after Retinex to restore tones

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Desmis
2015-09-16 18:47:11 +02:00
parent 5f97c4f15b
commit e9a8a6f32b
12 changed files with 219 additions and 4 deletions
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30
rtengine/color.h
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@@ -142,6 +142,11 @@ public:
static LUTf igammatab_24_17;
static LUTf gammatab_24_17a;
static LUTf gammatab_13_2;
static LUTf igammatab_13_2;
static LUTf gammatab_115_2;
static LUTf igammatab_115_2;
static LUTf gammatab_145_3;
static LUTf igammatab_145_3;
// look-up tables for the simple exponential gamma
static LUTf gammatab;
@@ -951,7 +956,32 @@ public:
{
return x <= 0.016613 ? x * 2.0 : 1.009968 * exp(log(x) / 1.3) - 0.016613;
}
static inline double igamma13_2 (double x)
{
return x <= 0.033226 ? x / 2.0 : exp(log((x + 0.009968) / 1.009968) * 1.3);
}
static inline double gamma115_2 (double x)
{
return x <= 0.001692 ? x * 2.0 : 1.000508 * exp(log(x) / 1.15) - 0.001692;
}
static inline double igamma115_2 (double x)
{
return x <= 0.003384 ? x / 2.0 : exp(log((x + 0.000508) / 1.000508) * 1.15);
}
static inline double gamma145_3 (double x)
{
return x <= 0.009115 ? x * 3.0 : 1.012305 * exp(log(x) / 1.45) - 0.009115;
}
static inline double igamma145_3 (double x)
{
return x <= 0.027345 ? x / 3.0 : exp(log((x + 0.012305) / 1.012305) * 1.45);
}
// gamma function with adjustable parameters
//same as above with values calculate with Calcgamma above