Matrix Operations for Image Processing

Matrix Operations for Image Processing

Four by four matrices are commonly used to transform geometry for 3D rendering. These matrices may also be used to transform RGB colors, to scale RGB colors, and to control hue, saturation and contrast. The most important advantage of using matrices is that any number of color transformations can be composed using standard matrix multiplication.

Please note that for these operations to be correct, we really must operate on linear brightness values. If the input image is in a non-linear brightness space RGB colors must be transformed into a linear space before these matrix operations are used.

http://www.sgi.com/misc/grafica/matrix/