Yuvval of_rgb : range -> (int * int * int) -> int * int * intval to_rgb : range -> (int * int * int) -> int * int * inttype planes = {width : int;height : int;chroma : chroma;y : Stdlib.Bytes.t;cb : Stdlib.Bytes.t;cr : Stdlib.Bytes.t;}val chroma_size : chroma -> width:int -> height:int -> int * intval of_image : range -> chroma -> Rgba_image.t -> planesval to_image : range -> planes -> Rgba_image.t