Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Mail Systems
Eclipse Documentation

How To Guides
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Problem Solutions





ImageMagick is the tool for transforming images.

The command line mogrify is excellent for changing the size of an image. mogrify -geometry does that, maintaining the image's aspect ratio (the specified width and height are maximum values) append the geometry with an exclamation point to force a change to aspect ratio.

Rotate an image with -rotate

Reduce the colors in an image: mogrify -colors 2 filename

To also dither the image: mogrify -colors 4 -dither filename

Monochrome image: mogrify -monochrome filename

Annotate image: mogrify -comment 'Hi there' filename

Add borders to image (pixel width and height): mogrify -border 2x4 filename

Decorative border: mogrify -frame 20x20 filename

Copyright © 1995-2006 [email protected]

  Published under the terms fo the GNU General Public License Design by Interspire