- A color model is a specification of a coordinate system within which each color is represented by a single point.
- Hardware-oriented color models; e.g., color monitors and printers,
RGB,CMY(cyan, magenta, yellow),CMYK(+black) - Application-oriented color model;
HSI(hue, saturation, intensity)
- Each color appears in its primary spectral components of R, G, and B
- Based on a Cartesian coordinate system (cube)
RGBand similar others are not practical for human interpretation.- Hue: a color attribute that describes a pure color.
- Saturation: a measure of the degree to which a pure color is diluted by white light.
- The
HSIspace is represented by a vertical intensity axis, the length (saturation) of a vector from the axis to a color point, and the angle (hue) this vector makes with the red axis. - The power of
HSIcolor model is to allow independent control over hue, saturation, and intensity.