Btw, this solution is done using imagemagick. You can also resize, rotate, sharpen, color reduce, or add special effects to an image or image sequence and save your completed work in the same or differing image format. Have a look at /usr/share/doc/imagemagick/html/ImageMagick.html in Knoppix.

For information on how to make the context menus, there is an excellent article on http://developer.kde.org/documentati...vicemenus.html

So, be creative!