Photoshop's Photo Filter is indeed an image adjustment rather than a filter. The filter in the name refers to those actual photographic filters that you screw onto the end of a lens. This adjustment is a great way to correct problems with temperature in an image — that perceived warmth or coldness of an image. When the camera takes a picture under unexpected lighting conditions, a color problem is apparent. (Say, for example, that the camera is set to Daylight when shooting indoors.) When an image is too blue, it's too cool; conversely, an image that's orangey is too warm. (Remember that these are the perceptual evaluations — blue light is technically hotter than yellow or red light.)
In Photo Filter, you select a preset filter from a pop-up menu or select a color of your choice. As you can see in Figure 6-17, both preset filters and custom colors can be effective in neutralizing a color cast. (You could, of course, also use these filters to add a color cast . . . if you wanted to, that is.)
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