Anyone ever tried the "Pixel Blender Toolkit" from Adobe?
http://www.adobe.com/devnet/pixelbender/
Adobe even set up a "Pixel Blender Exchange" for the developers.
http://www.adobe.com/cfusion/exchange/index.cfm?event=productHome&exc=26&loc=en_us
Pixel Blender Toolkit for the Mac: http://www.adobe.com/go/pixelbender_toolkit_dmg
Pixel Blender Toolkit for MS-Win: http://www.adobe.com/go/pixelbender_toolkit_zip
Pixel Blender Plugin for Photoshop CS4 32-bit: http://www.adobe.com/go/pixelbender_plugin_pscs4_32bit
Pixel Blender Plugin for Photoshop CS4 64-bit: http://www.adobe.com/go/pixelbender_plugin_pscs4_64bit
Developer Guide: http://www.adobe.com/go/pixelbender_devguide
Language Reference: http://www.adobe.com/go/pixelbender_langref