Corrective filters

Corrective filters are workaday tools that you use to modify scanned images and prepare an image for printing or screen display. In many cases, the effects are subtle enough that the viewer won't even notice that you applied a corrective filter. As demonstrated in Figure 10-1 and Color Plate 10-1, these filters include those that change the focus of an image, enhance color transitions, and average the colors of neighboring pixels. Find these filters in the Filter ^ Blur, Noise, Sharpen, and Other submenus.

Many corrective filters have direct opposites. Blur is the opposite of Sharpen, Add Noise is the opposite of Median, and so on. This is not to say that one filter entirely removes the effect of the other; only reversion functions such as the History palette provide that capability. Instead, two opposite filters produce contrasting effects.

Corrective filters are the subject of this chapter. Although they number fewer than their destructive counterparts, I spend more time on them because they represent the functions you're most likely to use on a day-to-day basis.

Figure 10-1: The gigantic head of 4th-century Roman emperor Constantine subject to four corrective filters, including one each from the Sharpen, Blur, Other, and Noise submenus (reading clockwise from upper left).

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