I'm sure I will be embarrassed with an obvious answer but what do the L, A and B numbers under the Histogram indicate? They show up when you are in the develop module and move the cursor around the image. (the numbers show up and replace the camera settings of the image when the cursor is over the image). Thanks in advance. They are not ever mentioned in any tutorial of the develop module.
In terms of Lab, start here:
http://digitaldog.net/files/10About%20Color%20Models.pdf
Then:
Everything you thought you wanted to know about Histograms
Another exhaustive 40-minute video examining:
What are histograms? In Photoshop, ACR, Lightroom.
Histograms: clipping color and tones, color spaces, and color gamut.
Histogram and Photoshop’s Level’s command.
Histograms don’t tell us our images are good (examples).
Misconceptions about histograms. How they lie.
Histograms and Expose To The Right (ETTR).
Are histograms useful and if so, how?
Low rez (YouTube): http://www.youtube.com/watch?v=EjPsP4HhHhE
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