This is a simple PNG writing function, intended to be as small as possible. It only supports RGBA 32bit PNGs and the input should be a buffer of rgba bytes.
Tested for python 2 and 3.
Python, 12 lines
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 | def write_png(buf, width, height):
import zlib, struct
width_byte_4 = width * 4
raw_data = b"".join(b'\x00' + buf[span:span + width_byte_4] for span in range((height - 1) * width * 4, -1, - width_byte_4))
def png_pack(png_tag, data):
chunk_head = png_tag + data
return struct.pack("!I", len(data)) + chunk_head + struct.pack("!I", 0xFFFFFFFF & zlib.crc32(chunk_head))
return b"".join([
b'\x89PNG\r\n\x1a\n',
png_pack(b'IHDR', struct.pack("!2I5B", width, height, 8, 6, 0, 0, 0)),
png_pack(b'IDAT', zlib.compress(raw_data, 9)),
png_pack(b'IEND', b'')])
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Can you provide some examples use in Python 2.7 ?