image - Compression and decompression of png files -


in web project, compressed png images optipng, -o3 compression. in modern browsers fine, visualization not affected , runs ok. but, have old device custom browser engine have problems compressed images. need decompress images, possible? if open images gimp (for example) can save png file again 0 compression, want ask if there "automatic" tool can that. optipng can't.

i believe can use zlib decompress png compressed optipng 

`zlib.decompress(file,level)` //python usage

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