The ImageMagick module now supports the changing of the output format/extension. How do I implement this with the Raw ImageMagick module (as the module specifies "Do not add an input or output file.")? I'm trying to convert user uploaded JPG via Media to PNG thumbnails.
From http://drupal.org/node/1206598#comment-4770038 ."They need to implement hook_imagemagick_arguments_alter() and (smartly) figure out whether they need to adjust the 'destination_format' in the alter hook."