// rest of the curve relatively little. Thus, we actually convert to gamma 2.2
// before lift, and then back again afterwards. (Gain and gamma are,
// up to constants, commutative with the de-gamma operation.)
+//
+// Also, gamma is a case where we would not want premultiplied alpha.
+// Thus, we have to divide away alpha first, and then re-multiply it back later.
#include "effect.h"