ImageMagick®, is a free software suite to create, edit, and compose bitmap images. It can read, convert and write images in a large variety of formats. Images can be cropped, colors can be changed, various effects can be applied, images can be rotated and combined, and text, lines, polygons, ellipses and Bezier curves can be added to images and stretched and rotated.
First check if ImageMagick already installed on your computer. To do this use the command "convert -version"
You can download latest version of ImageMagick from here
tar zxvf ImageMagick.tar.gz
After installation, you can call program convert to see if ImageMagick properly installed.
If you need, we can install ImageMagick on your server for $15