In overlay matte, use the luminance as a matte instead of each individual color compo...

[movit] / saturation_effect.h

diff --git a/saturation_effect.h b/saturation_effect.h
index 6cfc3d0ee0392c49d18e5a0b3f782c40fc5889e9..180210c7edc9682e97ca7db77ae2c78e62287543 100644 (file)
--- a/saturation_effect.h
+++ b/saturation_effect.h
@@ -1,6 +1,12 @@
 #ifndef _SATURATION_EFFECT_H
 #define _SATURATION_EFFECT_H 1
 
+// A simple desaturation/saturation effect. We use the Rec. 709
+// definition of luminance (in linear light, of course) and linearly
+// interpolate between that (saturation=0) and the original signal
+// (saturation=1). Extrapolating that curve further (ie., saturation > 1)
+// gives us increased saturation if so desired.
+
 #include "effect.h"
 
 class SaturationEffect : public Effect {