I would like to be able to see the lab color info in addition to the RGB numbers in Camera Raw. The
Camera Raw color correction sliders are lab in nature, and the Lab numbers are
easier for color correction than the RGB numbers.
Some reasons that lab numbers are easier to use are: they don’t vary from color space to color space,
as there is only one set of lab color numbers, and common colors like skin tones,
natural greenery, neutrals, and skies are easy to remember.
While I do most of my color correction in Photoshop RGB, I view the lab colors in the info tab. It would be nice to be able to do the correction in ACR.