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Welcome to AdvanceCOMP Help
I hope for a frontend(GUI) for AdvanceCOMP.
And a comparison with Pngcrush will be nice.
Thank you for this cool program!! ;-)
I used pngcrush, and pngcrush could compress png even a little more than -4 compression in AdvPng, but it was much longer, and little gain, so I decided to stay with Andrea's tools.
To recompress the PNG images when I create binary packages using my script, I use
"advpng -z4; optipng -o5 -i0 -fix; advdef -z4"
Before, I used "optipng -o5 -i0 -fix; advpng -z4; advdef -z4" but I found out that putting advpng first increase compression. My next optimization will be to run advdef only on files optipng touched. It will be a bit easier with my optipng patch that provide a -summary mode whose output is very similar to AdvanceCOMP programs.
optipng is a faster pngcrush clone (not a fork).
Sorry, but a GUI is not planned. These are only command line utilities.
Your findings with optipng are reasonable. The optipng utility seems to be more advanced than advpng, so you should get the same results not using advpng at all.
The only missing thing in optipng is the advanced deflate implementation used by advdef and advpng. And using advdef as last stage should be enough to fix it.