Uniform Color across 50+ images with Kodak color bar

Hi,
I shoot 50+ paintings using a Kodak color bar at the bottom of each image, thing is during the shoot the light change from start to finish as the sun moved around, (dumb I know), so is there anyway to get the images to be uniform color across the whole collection. I want to acheive where the color bar is exactly the same in each image?
I shot everything in RAW...
Thanks
SEan

You're going to have to do an individual gray balance on a white or gray patch on every image, as it will not be the same correction for each image. As the light changes it changes color, which is going to be the biggest factor. The changing angles of light reflecting off the paintings can also affect the color rendition. In the end, it really depends on how accurately you need to reproduce the color in the paintings. The more accurate you need to be, the more you will need to make individual corrections in Ps for each image.
When I do this, I correct to the actual painting viewed under a Solux lamp 90 degrees away from my monitor. The best and most accurate color I've seen to date is processing the raw files in CaptureOne and gray balancing to a portion of the white seamless paper in the background. Even complicated paint pigments came right into line with a single click. The input profiles in C1 are truly amazing now.
You may run into problems also with the Kodak color bars themselves. Far too often when you get them looking right, your painting is way off. The pigments used in the color bars react differently to light than the pigments in the painting, and the grayscale steps are never right. They always seem to clip both ends long before you start clipping any detail in your painting.

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