Simply unzip "channelmod.zip" and copy "channelmod.8bf" to your "\Photoshop\Plug-Ins\" folder, or whichever plugin folder your host program uses. Load your program, open an image, go to the plugins menu and select the plugin.
This filter will perform various operations on color channels.
Step 1: Select the type of operation you would like the filter to perform.
Step 2: Specify the color channel to be modified.
Step 3: Specify the color channel to assist with the modification.
Reset: This option resets all variables to their default values.