hhoy / python-zopflipng

Lossless PNG compressor - Use the zopfli compression algorithm，It works in python

ZopfliPNG wrapper for python

This library wraps the zopflipng extension to implement lossless compression of PNG.

• Lossless compression of PNGS implemented by zopfli typically results in a compression ratio of 5% more than other lossless compression tools at the expense of longer compression time.

Install

pip install zopflipng

Usage：

# a simple example, using the default configuration

from zopflipng import png_optimize

data = open('test.png', 'rb').read()
result, code = png_optimize(data)
# if code ==0 ,png compression success
if code == 0:
   # save png
   with open('result.png','wb') as f:
       f.write(result)
       f.close()

• Use quick, but not very good, compression:

result, code = png_optimize(data, use_zopfli=False)

• Compress really good and trying all filter strategies:

result, code = png_optimize(data, lossy_8bit=True, lossy_transparent=True, filter_strategies='01234mepb', num_iterations=500)

If you want to process multiple images, use multiprocessing