mogrify program to resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more. This tool is similar to
convert except that the original image file is overwritten (unless you change the file suffix with the
-format option) with any changes you request. See
Command Line Processing for advice on how to structure your
mogrify command or see below for sample usages of the command.