For the purposes of discussion, unless otherwise noted, all image data is considered to be grayscale. This simplifies things because grayscale images are a single plane of brightness intensities, whereas color images are three planes of intensities for red, green, and blue. Extending the discussed concepts from grayscale to color is almost always a simple matter of just repeating the processes two more times (i.e., treating a color image as if it were three grayscale images).