doozie noun A person or thing that is remarkable, wonderful, superior, etc; beaut, humdinger: a little 30-page doozey called ''Making Chicken Soup''/ Want a swell Naval Air Station?
According to Apple Inc., the RGB signal is the standard signal for most computer graphics and video files. It is named for the colors red, green and blue. These colors, in certain combinations and intensities, can create any other color. RGB also supports grayscale, ranging from black to white.
However, a grayscale image typically represents the Luminance component of an RGB image. That is, from RGB you translate to YCbCr and then Y is the grayscale. R, G, or B as monochromatic images can be quite distinct from the Y image. So, for image processing. Say you want to detect Red eye in an image.