StumpyPNG

HEADER = 9894494448401390090_u64

WRITE_BIT_DEPTHS = {8, 16}

WRITE_COLOR_TYPES = {:rgb => 2_u8, :rgb_alpha => 6_u8, :grayscale => 0_u8, :grayscale_alpha => 4_u8}

read(path : String)

read(io : IO)

write(canvas, path : String, **options)

write(canvas, io : IO, **options)