USAGE: saturation [value] infile outfile
USAGE: saturation [-h or -help]

value ................ saturation gain factor (float);
...................... sat>=0.0; default=1 (no change)
-h or -help .......... get help

PURPOSE: To change the color saturation in an image.

DESCRIPTION: SATURATION changes the color saturation in an image in a linear manner. The image is first converted to HSL colorspace and then the saturation value is used as a multiplier for each value in the S channel. Then the modified saturation channel is recombined with the H and L channels and the image is converted to RGB colorspace as output.

ARGUMENTS:

value --- value is the saturation factor. It is a multiplier for the saturation channel in an image. Values greater than 1 will increase the saturation of the image and values less than 1 will decrease the saturation of the image. The default is 1 or no gain.

CAVEAT: No guarantee that this script will work on all platforms, nor that trapping of inconsistent parameters is complete and foolproof. Use At Your Own Risk.