Well...
The
ImageMagick is a freeware for image edit for linux, windows, mac...
I crosscompile that and add a gui so you can use this
INSTALATION
unzip the file and copy to /mmc/mmca1/zImageMagick
USAGE: copy the file you want to modify into /mmc/mmca1/zImageMagick
open the app, go to Open file menu and select the file, remember it must be in /mmc/mmca1/zImageMagick, go to Save as... and choose the name and the path, it will be saved in /mmc/mmca1/zImageMagick or it doesn't work, now go to efects menu and choose the what you wan't...
Screenshots:
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