The original image has a strong blue cast (example A. Then, using a Curves adjustment layer and your sample point and Info palette as references, you can make the RGB numbers equal to neutralize the color cast. Using your Color Sampler tool you can sample such an area. Concrete or tarmac, for example, should be gray, and gray is neutral. The easiest types of images to correct by the numbers are those that include reference colorsareas we can confidently say should be neutral. Making such a change in the midtone area is usually enough to fix the color cast throughout the image, but if necessary you can also adjust highlights and shadows by shaping your curve accordingly. Adjusting individual color curves makes it possible to equalize the RGB levels at any point on your image, thus neutralizing these areas. It doesn't matter exactly what the numbers are, just that they are the same. Neutral areas are made up of equal parts red, green, and blue. When color correcting by the numbers, you identify an area of your imagepreferably a midtone areathat should be neutral gray. There are two basic approaches to removing a color cast: by the numbers and subjectively. ![]() ![]() Bad color casts are the green complexions of people photographed under foliage, the jaundiced look of shots taken indoors under electric light, or the blue-rinse look your photos may have if the white balance of your camera was incorrectly set. ![]() An orange color cast in a dramatic sunset picture, a yellow cast from late afternoon "magic light," a red cast from a concert photo taken under stage lightsthey're all good. This ability to target specific zones of specific channels is the foundation for color correctionif you have a red color cast, you pull down the curve of the Red channel.īefore we send out a posse to round up all our images with color casts, it's worth reflecting that not all color casts are bad. So far we've worked only on the composite RGB channel, but you will remember from Chapter 2, "Channels," that you can also work on specific color channels.
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