Hi,

I recently shot an event during a cloudy day and left my White Balance
set to direct sunlight. All of the pictures are way too blue and all of
the skin tones are miserable. Unfortunately, they were all JPGs, not
NEFs so I can't directly fix the Color Temperature.

The "Photoshop Professional" book says to convert the RGB to CMYK, use
the eye dropper to pick the whitest point and set it to 5c, 2m, 2y. Set
the darkest point to 80c, 70m, 70y, 70b. Set the caucasian skin tones to
6c, 30m, 35y. For a single picture which you can dedicate a lot of time
to, this is not bad.

When you have 355 pictures which all need the same direct sunlight to
cloudy white balance change, this would take all day.

I am experimenting with recording an action to read each image in a
directory, and adjusts the color balance like this: move the blue
midtones to -6 and the red midtones to +2. Then do the same for the
highlights. I can't figure out what to do with the greens!

This is kind of hit and miss, but it usually improves most of the
images. Is there a better way to do this? I tried
Image->Adjustments->AutoColor, but it usually makes them worse.

Since I shot them at 5200 Kelvins, is there a formula or rule of thumb
to convert them all to 6000 Kelvins? +800 Kelvins == blue high+mid -4,
red high+mid -3, green high +1???

Thank you,

BrianP