Y
- YIQ color space
- A universal color space, used for color television transmission, whose components are Y, I, and Q. Y represents luminance and the other two components carry color information.
- Yxy color space
- A color space belonging to the XYZ base family that expresses the XYZ values in terms of x and y chromaticity coordinates, somewhat analogous to the hue and saturation coordinates of HSV space.