In LRGB imaging, a Luminance (L) frame is added to the standard RGB mix. The Luminance fully or partially replaces the luminance information from the filtered images. Since the human eye has lower resolution in color than in luminance, the R, G, and B images are sometimes binned to allow shorter exposures; the difference between binned and non-binned RGB components is generally not discernable. The Luminance image carries the detail and requires the highest resolution possible, so it is generally unbinned and often taken with a longer exposure duration to increase its signal-to-noise ratio.
MicroCCD supports LRGB imaging via the Combine Color command, which can automatically rescale the binned color frames to match the luminance frame. MicroCCD's automated imaging supports only RGB imaging.