module Pixel: sig .. end
sig
end
type rgba = int * int * int * int
int * int * int * int
type rgb = int * int * int
int * int * int
type yuv = int * int * int
type yuva = yuv * int
yuv * int
val yuv_of_rgb : rgb -> yuv
rgb -> yuv
val rgb_of_yuv : yuv -> rgb
yuv -> rgb