I have been trying to use both of the methods listed (http://www.damiensymonds.net/2010/01/channel-mixer-to-fix-sun-flare.html and http://www.damiensymonds.net/2011/01/ridding-pesky-rainbows.html) but I am failing miserably. I can't seem to successfully use the channel mixer to do what I'm trying to do. Help, please!