The ImageMagick's first cross-stable release of the software was in the year 2002. It has recently, on April 27th 2013, released another stable version of the software.

With program convert, part of package ImageMagick.

You can use ImageMagick library and use 'convolve' function.

the command "display" brings up the ImageMagick program.

ImageMagick, u can google for answer. I use Batch Watermark Creator for protecting my images by visible watermarks: http://www.easy-tools.net/batch-watermark/index.html watermark your pictures step by step: http://www.easy-tools.net/batch-watermark/on-line-help.html Its what I use anytime I dont wanna spend to much time in photoshop and still want quality results.