The Grayscale image effect changes colors to grayscale. It can also use a Texture Ramp texture to remap luminance to arbitrary colors.
Grayscale image effect applied to the scene
Grayscale can do a simple version of color correction, i.e. remap grayscale image into arbitrary colors. This can be used for effects like heat vision.
The process of color remapping is very similar to ColorCorrection effect:
Color remapping works by remapping the original image luminance through the color ramp image (sized 256x1):
Grayscale applied to the scene with color ramp that goes from white to black.
A more complex version of color remapping that does arbitrary color correction can be achieved with ColorCorrection 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