Using GraphicsMagick instead of ImageMackick fails

Note: GraphicsMagick, a performance fork of ImageMagick (like Pressflow to Drupal) should work as well. Just replace the convert executable with gm in the image toolkit settings.

This doesn't work. The command should be gm convert INPUT OUTPUT. Just replacing convert with gm generates a command like gm INPUT OUTPUT, which fails.

I've added a small piece of code to _imagemagick_convert_exec():

  if (strpos($convert_path, 'convert') === FALSE) {
    $convert_path .= ' convert';
  }