$ mogrify -geometry x31 path/to/image.gif

April 3, 2012, 9:48 p.m.Janos


  • mogrify is part of ImageMagick, an image manipulation software suite
  • mogrify manipulates the specified images. If you prefer to keep the original image untouched and write the manipulated image to a different file, simply replace mogrify with convert, the syntax is the same, but the last command line argument will be the target image to write to.
  • The -geometry flag is to resize the image, it requires a dimension parameter in the format WIDTHxHEIGHT
  • The dimension in this example has no width, which means the image will be resized to height=31 pixels, and the width will be proportional.


ImageMagick is not a standard package, though it is open source and available in many systems.