Canon RAW and custom white balance

[Scott1970]

I was playing with an infrared filter this weekend with my Canon 7D.

One thing I tried was to use the custom white balance setting, shooting a white sheet first, and applying this white balance to following images. The white balance is applied to jpgs, but not to RAW.

I would like to be able to take the initial white balance calibration photo and subsequent photos in RAW and use photoshop (CS4) to make the same color transformation that the camera is doing, so i can do additional processing with the RAW image in photoshop.

Does anybody have instructions, or a helpful link?

[Bob_S]

RAW images aren't affected by any settings for WB, sharpening, saturation etc. All of those things are set in your camera and they only alter the JPEG images. You can set your WB to tungsten and shoot in green florescent and still be ok with your RAW images.

You're on the right track though. When shooting RAW, shoot something you know to be white like a grey card. You used a white sheet. Open that image in PS or LR or whatever and set the WB to the portion of the image with the known white/grey using the white balance selector. (In LR it is an eye dropper looking tool.) That will give you a WB setting in degrees. Let's say it comes up with 4020 temp with +20 tint. Use those numbers to adjust your settings for all of the other pictures you shot under the same conditions.