Originally Posted by Lowell Goudge
I shoot JPEG and while adjustments are just as easy during PP as with RAW for WB, it is always better to start close, especially since JPEG is only 8 bit color not 12 as your RAW image
I would disagree on two counts:
First, the key difference between correcting WB in raw versus JPEG is that WB corrections in raw do not change any pixel values. A radical WB change in JPEG will likely introduce posterization, and not just because JPEG is 8-bit. It's because colour adjustments to JPEG images must necessarily change the image pixel.
Also, when using a dedicated photo-organizing tool such as Lightroom or Aperture, it is very fast to make WB corrections to a large number of photos. Before adopting Lightroom, I couldn't bear to shoot in raw because of the amount of additional work involved. Now, it's actually faster than shooting JPEG and using Photoshop alone.
So whens hooting, I simply guesstimate the correct WB setting in the camera (usually leaving it on either Auto or Tungsten), and fix it later.