X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=vignette_effect.h;fp=vignette_effect.h;h=c9a08bfd8f85091ec711175b274de77cb9b09359;hp=82c648cf7b3f834ee876b8dbb89dac3150f4820f;hb=e8650c7b7814c5beef59059b8acac3e5e7b8ddc6;hpb=b77dca09201f3373c5466d695338e1e29406072b

diff --git a/vignette_effect.h b/vignette_effect.h
index 82c648c..c9a08bf 100644
--- a/vignette_effect.h
+++ b/vignette_effect.h
@@ -1,6 +1,9 @@
 #ifndef _VIGNETTE_EFFECT_H
 #define _VIGNETTE_EFFECT_H 1
 
+// A circular vignette, falling off as cos² of the distance from the center
+// (the classic formula for approximating a real lens).
+
 #include "effect.h"
 
 class VignetteEffect : public Effect {