The Color Space refers to a 3D color model that contains a subset of colors in which all colors of a particular gamut are visible. A color space is also known as a color model. The purpose of the color space is to allow the specification of certain colors within a particular gamut of color. There are a number of color spaces used in a wide array of applications including graphics, desktop publishing, desktop video, and NTSC video. F/x uses the following color spaces: RGB (red, green, blue), CMY (cyan, magenta, yellow), CMYK (cyan, magenta, yellow, black), HSL (hue, saturation, and luma), HSV (hue, saturation, value), and YIQ (luminance, chrominance). Each of these color spaces have a physical 3D model which describes their color gamut. It is important to remember that F/x uses "pure colors" instead of actual colors. This is due to the fact that some colors do not exist in some of the other color spaces. For example, the RGB color space contains colors which cannot be represented by the YIQ color space model. If you are converting from color space to color space, F/x will automatically select the color which is closest to the original color value.