ABSTRACT
In this chapter, the authors provide some fundamental image processing techniques that deal with processing the colors of the image. They examine a large number of techniques that start from one or more color images and combine them to create a new image or generate new information about the scene. The authors discuss a photometric processing application that is the computing shape of objects from illumination changes in images. Illumination contributes to the photometric properties of an object. One common application of histogram processing is to enhance the contrast of the image, using a process called histogram stretching. Photometric stereo computes the light directions also in addition to the surface geometry. To apply histogram processing to color images, the treatment differs based on the application. Image composition is quite commonly used in the entertainment industry where often virtual objects or characters from past or artistic effects have to be worked in the images/videos captured.
