The document discusses color image processing and color models. It provides information on several topics: - Color images can be characterized using a three-dimensional color space model. Common color models for different applications include RGB, CMYK, and HSI. - Digital image processing techniques allow for objective measurement and analysis of image properties compared to manual interpretation. - Common color models are RGB for monitors/video, CMYK for printing, and color features can be used for applications like face recognition. - A color model represents colors as sets of numbers in a coordinate system. Models discussed include RGB, CMYK, and RYB. CMYK uses percentages of cyan, magenta, yellow and black in