Color Cast Correction

Single Channel Mid Tone Adjustment—Color Cast Correction

When one channel is out of value compared to the other two, perform a single-channel correction.

Single Channel Correction

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

The Blue Channel is out of neutral color alignment.

In the Info Palette readout, the numbers to the left of the "/" represent the input value, and those to the right represent the output value after the Curves adjustment. In the example above, sample #5's Blue channel value is 183, and the Green and Blue channels are 188. By adjusting only the Blue channel in Curves, it can be brought up to the level of the other two.

By moving the Midpoint of the Blue channel down in this instance, you can neutralize the mid value in the image. The Point Sample must be set to a neutral value.

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

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

Two Channel Mid Tone Adjustment—Color Cast Correction

Info Palette readout for one of the Color Sampler points

When all three channels have different values from each other, perform a two-channel correction.

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

In the example above, sample #1's Red channel value is 193, the Green is 183, and the Blue is 174. By decreasing the Red channel to 183 and increasing the Blue to 183 using the individual channels in the Curves dialog box, the three sample point values all read 183, or neutral.

I recommend setting color sampler points on 3 or 4 neutral, near-midtone areas in your image. You can set as many as ten sample points. You will rarely get equal RGB readouts across three or more sample points. Do the best you can by averaging the differences. Look for the pattern.

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