[Bf-cycles] Two nodes that Cycles needs

[Sid Datta]

One: RGB Curves
http://wiki.blender.org/index.php/Doc:2.4/Reference/Nodes/RGB_Curves_Node

This is extremely useful for achieving interesting texture effects.

Two: RGB Ramp

http://wiki.blender.org/index.php/Doc:2.6/Manual/Materials/Nodes/Types/Convertor

Essential for creating custom color effects out of procedural textures.

I understand the developers are busy with more important stuff, so if
anyone can lead me in the right direction by giving me a few file names and
function names in the source tree, I can give it a shot (complete newbie,
no promises :P).

Thanks
-Sid
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