FlySketch Graphic Compositing Modes

If you are running FlySketch 1.5 on Mac OS X 10.4 or later, you will notice an extra pallet with various “Compositing modes”. What the heck are those?

Well, direct from Apple, here’s what you get:

Shamelessly stolen from: http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/ObjC_classic/Classes/NSImage.html