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:

• Clear
  Transparent.
• Copy
  Source image.
• Destination Atop
  Destination image wherever both images are opaque, source image wherever source image is opaque but destination image is transparent, and transparent elsewhere.
• Destination In
  Destination image wherever both images are opaque, and transparent elsewhere.
• Destination Out
  Destination image wherever destination image is opaque but source image is transparent, and transparent elsewhere.
• Destination Over
  Destination image wherever destination image is opaque, and source image elsewhere.
• Plus Darker
  Sum of source and destination images, with color values approaching 0 as a limit.
• Plus Lighter
  um of source and destination images, with color values approaching 1 as a limit.
• Source Atop
  Source image wherever both images are opaque, destination image wherever destination image is opaque but source image is transparent, and transparent elsewhere.
• Source In
  Source image wherever both images are opaque, and transparent elsewhere.
• Source Out
  Source image wherever source image is opaque but destination image is transparent, and transparent elsewhere.
• Source Over
  Source image wherever source image is opaque, and destination image elsewhere.
• XOR
  Exclusive OR of source and destination images. Works only with black and white images and is not recommended for color contexts.

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


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