“y-axis” to “YUV”

y-axis

(n.) The vertical axis in the Cartesian coordinates system. Although coordinate systems can be moved and their orientations can be altered, the y-axis is always perpendicular to the x-axis. See also z-axis.

YUV

(n.) A color model that is used in the PAL (European) television format. Each color is represented by a combination of three components: Y, U, and V. The Y component represents the luminance, or brightness, of the color. The U and V components carry 1.3-MHz chrominance information.