type t = {shift : int;len : int;mask : Stdlib.Int32.t;
}val of_mask : Stdlib.Int32.t -> (t, [> errors ]) Stdlib.resultval of_mask_exn : Stdlib.Int32.t -> tval convert_3_to_8_bit : int arrayval convert_4_to_8_bit : int arrayval convert_5_to_8_bit : int arrayval convert_6_to_8_bit : int arrayval color_of_pixel : t -> int32 -> int