Color Cast Correction

Single Channel Mid Tone Adjustment—Color Cast Correction

When one channel is off value from the other two, perform a single channel correction.

 
 
info2.gif

Info Palette with four color sample points

Single Channel Correction

If two channels are near in value to each other and one is not, move the odd channel to the value to that of the two consistent channels.

In the Info Palette readout, the numbers to the left of the "/" represent the input value. The numbers to the right represent the output value after the curves adjustment. In the example to the left, sample #4's Red channel value is 111 and the Green and Blue channels are 115. By adjusting only the Red channel in Curves, it can be brought up to the level of the other two.

You will rarely get all three values in all four samples to equate. Do the best you can averaging the differences. Look for the pattern.

Normally , you won't adjust more than two channels. See FAQs for an explanation.

 
info3.gif

nfo Palette with four color sample points

Two Channel Mid Tone Adjustment—Color Cast Correction

When all three channel are different in value from each other, perform a two channel correction.

If all three channel values are different from each other, move the high and low values to the middle value.

In the example to the left, sample #1's Red channel value is 144, the Green is 160, and the Blue 167. By increasing Red channel to 160 and reducing the Blue to 160 with individual channels Curves, the three sample point values all read 160 or neutral.

You will rarely get all three values in all four samples to equate. Do the best you can averaging the differences. Look for the pattern.

Normally , you won't adjust more than two channels.

 

On the next page we will look at sample point placement in our demonstration image.

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