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Kim Rollins | all galleries >> Tutorials & Other Stuff >> Tutorial - Determining Color Cast by Reading the Histogram > example 2 before and after.jpg
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example 2 before and after.jpg

This is an example of another picture it's color cast and a correction.

I read the Histogram before the correction as saying - dark side OK for color cast.

Then I read the Histogram at right (highlights) with two short colors as having a Blue color Cast by using the chart previously provided

R+G=blue color cast

R+B=green color cast

G+B=red color cast

Color cast correction - blue down in highlights was made by taking picture to levels and clipping each channel at right. I started with red, then green to move the right end of these Histograms over a bit. My adjustments there moved them just past the end of the blue so I then adjusted the blue channel too a bit.

The one at the bottom of the picture above shows as adjusted. The shadows behind the Histogram at the bottom are where the histogram was before my adjustment.


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Kim Rollins12-Jun-2008 08:46
On this particular image (hawk) the adjustment was as stated on the page -
"Colour cast correction - blue down in highlights was made by taking picture to levels and clipping each channel at right. I started with red, then green to move the right end of these Histograms over a bit. My adjustments there moved them just past the end of the blue so I then adjusted the blue channel too a bit."

However the colour adjustment technique is image dependent and it will not be the same for each image. What technique works for one image my not work best for the next one. How one learns which will work best is experimentation and practice. I wish it was simpler then that but... it is not.
It might be levels adjustment on one, Colour Balance on the next, Selective Colour, Curves, or... other adjustments or combinations. Each of these and others I 'usually' run under a New Adjustment Layer (I speak Photoshop).
Layer>New Adjustment Layer> (Choice of correction)
I often try Colour Balance Adj. first and in doing that on a layer if it does not work it is easy to back out of and go with a diff. technique.
Nancy 15-Mar-2008 18:37
Great tutorial except for how you did the color corrections. Am I asking too much in asking HOW or what you did to get each color adjusted. At least now I have an understanding of which color is off. Thanks!