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

value ................ saturation gain factor (float);
...................... sat>=0.0; default=1.0 (no change)
...................... must specify one digit after decimal
-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 1.0 will increase the saturation of the image and values less than 1.0 will decrease the saturation of the image. The default is 1.0 or no gain. Note: must specify the decimal point and one digit following it.

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.