Perfectly Even Copy Lighting - Page 3
After you have captured the white frame, substitute the artwork. Once it is in place, capture a frame of the artwork. As mentioned before, it is very important not to change any the placement of the lights or any other variable that will affect the quality of the illumination.
Pictured above is the photo that will be copied. I have included a wide white border on the bottom of the print so that the falloff is more noticeable. Convert the RGB image to Lab Color (Image>Mode>Lab Color) and save this image as is. It will be color corrected later.