Base class for colors and textures.
void addLight( mixed Image_3D_Color$color, [mixed $intensity = .5], Image_3D_Color $color)
Add an light which influence the object this color is created for
void calculateColor( )
Calculate color depending on the lights
array getValues( mixed $alpha)
Return an array with rgba-values
void mixAlpha( [mixed $alpha = 1.])
Apply alpha value to color. It may be int or float. 255 / 1. means full oppacity
