Remove alpha channel from png pack?

Question

linux

Hello.
I'm trying to remove the alpha channel from a group of png files in a folder, and optimize if possible.
I have pngcrush, but somehow it didn't work. Perhaps someone faced similar problems. I will be glad to any feedback. Thank you.
Oh yes! Ubuntu 12.10

Answer 1

This is how you can render all translucent pngs into folders on a black (or other) background using imagemagick:

find . -name "*.png" -exec convert {} -background black -flatten +matte {}.converted.png \;

In the case of 8-bit images, you may also need the -type palette switch.

Answer 2

find /path/to/folder -name *.png -exec command_doing_the_necessary_action {} \;
instead of {} find will substitute the name of each file itself.