How to set white point in "Levels" - using a different photo

Hello all,
I'm taking shots of some furniture I made. I get the shot all set up and the exposure correct for what I want, then I take an 'extra' shot with a gray and a white calibration card in the scene. Now I have two identical shots except that one has the calibration cards. My question is: how to I select the white (and gray) levels from the calibration shot and then use that data to set the white (and gray) levels in the good shot. I had done this many years ago in CS3, but I don't remember the process. Any help is appreciated.
Thanks,
Kevin H.

Kevin,
this is one possible workflow:
Using the image with card:
Image > Mode > Lab
Layer > New Adjustment Layer > Curves
Apply changes as required for the card (neutralization)
Save As *.acv
Then apply this file to the photo without card.
If required convert Lab to RGB.
How to apply a complete color correction for reproduction:
http://www.fho-emden.de/~hoffmann/camcal17122006.pdf
Best regards --Gernot Hoffmann
Language problem:
Is a ColorChecker a card or a chart?
Edited:
According to
http://en.wikipedia.org/wiki/ColorChecker
it's a chart
Edited:
Curves is much more effective than Levels.

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