If you're using Capture One you can use the LCC tool to even out lighting on the artwork. Obviously it's best that you get the lighting as close as reasonable effort/equipment can get you. However, with a digital back's file latitude and the accuracy of the LCC tool you'll find that even a half stop variation will result in almost no noticeable image quality degradation.
1. Light the artwork as well as you can (using polarizers where possible/practical) and high quality lights that have consistency from one pop of the flash to the next (I suggest Broncolor or Profoto - but I'm very biased - see signature)
2. Place a piece of white seamless over the artwork and fill the camera frame with that white. Avoid wrinkles/bowing. A piece of white mattboard or other taunt material also works - just needs to be white and fill the frame.
3. Capture a frame of just the white material
4. In the Lens Correction tab select [LCC > Analyze] and name it something pertinent
5. Capture a frame of the artwork
6. In the Lens Correction tab select [LCC > {name of the LCC you made in step 4}]
If you're shooting a lot of pieces in the same lighting you can set in the Camera Tab [Next Capture Adjustments > Copy from Primary] so that the LCC is applied to incoming captures (it's still a raw file in case you want to adjust/remove the LCC later) as you shoot them.
This also corrects for any lens fall off (though it should be very slight at the standard f/8-f/11 art repro apertures).
This also corrects for any slight variation in color temperature (from uneven power, poor quality strobes, or aging of the glass/bulb).
Doug Peterson
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Head of Technical Services, Capture Integration
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