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How to remove a color cast
Sometimes an image can have a color cast that is very hard to determine. Especially if you do not know any area in the image that should be neutral grey, it can become hard to correct such a cast, even using the first method described on this site. In that case you can use an alternative method, which is based on the fact that the average of all pixels in a neutral image should normally also be neutral. This method works on most images.
Make a copy of the image in a new layer by dragging the background layer onto the ‘New Layer’ icon. Then use ‘Filter – Blur – Average’ on this layer. You will get an plainly colored layer, the color of the layer being the same as the color cast of the image.
Make a new ‘Curves’ adjustment layer, and pick the grey eye-dropper tool from the curves dialog. Click anywhere in the image to neutralise the ‘average’ layer you created in the previous step.
You have now effectively found the right corrections for the color cast. The only thing is that the ‘average’ layer is still in the way. We don’t need it however, so just drag that layer to the trash. You can now go to the white point and black point eyedroppers in the adjustment layer to set those points as well.
Note: This method does not work well if you have an image with a dominant color, such as a portrait shot against a colored background. In that case you can try the following adaptation: After you’ve copied the image, select a part of it using the rectangular selection tool (or any other selection tool). Try to select a part that is representative for a ‘normal’ photo. Blur only that part rather than the entire layer. Don’t forget to deselect before you add the Curves adjustment layer. If you don’t, the selection will become a mask.
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