ImageLib.PNGinclude Image.WriteImageval write : ImageUtil.chunk_writer -> Image.image -> unitinclude Image.ReadImageval size : ImageUtil.chunk_reader -> int * intval parsefile : ImageUtil.chunk_reader -> Image.imagemodule ReadPNG : Image.ReadImageval write_png : ImageUtil.chunk_writer -> Image.image -> unitval bytes_of_png : Image.image -> Stdlib.Bytes.t