I know the "Apply Image" and "Calculations" have a lot in common, but that's about all I know about them, other than the fact that "Calculations" works only in grayscale. I don't remember these two things being used much in the challenges descriptions. Is it possible for someone to write a tutorial which would explain how to use these for best results? Okay Jak, are you going to write it, or help me in yelling for someone else to do it? 
Ed

Ed
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