Color.Swizzle
Description
Specifies a color channel swizzle operation.
The following color channel identifiers may be used:
0 : constant color channel value 0,
1 : the red channel of the input color,
2 : the green channel of the input color,
3 : the blue channel of the input color,
4 : the alpha channel of the input color,
5 : constant color channel value 1.
To invert an input color channel, specify the negative value of its identifier.