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optipng

optimize png (and bmp, gif, pnm or tiff) images, install with apt-get install optipng

default usage

this will override the current file and save it with the default settings. this usually works best for me

optipng input.png

maximum optimization

you can do -o2 to -o7 (check the man page for any updates and changes etc.)

optipng -o7 input.png