Color Correction allows you apply arbitrary color correction to your scene as a postprocessing effect (just like the Curves tool in Photoshop or Gimp). This page explains how to setup color correction in Photoshop and then apply exactly the same color correction at runtime in Unity.
Like all image effects, Color Correction is only available in Pro version of Unity. Make sure to have the Pro Standard Assets installed.
Color correction works by remapping the original image colors through the color ramp image (sized 256x1):
So for example, to invert the colors in the image you only need to flip the original color ramp horizontally (so that it goes from white to black instead of from black to white).
A simpler version of color remapping that only remaps based on luminance can be achieved with Grayscale image effect.
This effect requires a graphics card with pixel shaders (2.0) or OpenGL ES 2.0. PC: NVIDIA cards since 2003 (GeForce FX), AMD cards since 2004 (Radeon 9500), Intel cards since 2005 (GMA 900); Mobile: OpenGL ES 2.0; Consoles: Xbox 360, PS3.
All image effects automatically disable themselves when they can not run on end-users graphics card.
Page last updated: 2013-02-01