Enchanting Pictures with ImageMagickMay 10, 2007, 19:15 (0 Talkback[s])
(Other stories by Borys Musielak)
[ Thanks to Borys Musielak for this link. ]
"We can use two programs from the ImageMagick package to transform stuff – convert and mogrify. They are almost identical from the user’s point of view, but convert saves the result image into another file, while mogrify does all the modifications on the original, overwriting it."