Lower-contrast image on the right.

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When working with the Threshold slider, values from 0 to 255 can be used. A very low value means that edges with relatively small contrast differences will be accentuated. High values mean that the difference must be very great before any additional sharpening is applied. Normally, you'll need this control only when the default value produces an image with excessive noise or some other undesirable effect. To be honest, in all the years I've used it, changing the Threshold slider has produced effects that were hard to predict, because they varied widely depending on how the other two controls were adjusted, and the nature of the image itself. Your best bet is to set the Amount and Radius sliders first, then experiment with Threshold to see if you like the results any better.

Figure 2.27 shows my baseball picture after I experimented with the Unsharp Mask filter to optimize the sharpness. The view is still not as good as a front row seat, but then, I didn't have to pay a lot for my tickets or tote around a mammoth telephoto lens, either. If nothing else, Photoshop helped me create a souvenir of an exciting game.

Figure 2.27. Photoshop simulated a long telephoto lens by sharpening this tightly cropped image.

Figure 2.27. Photoshop simulated a long telephoto lens by sharpening this tightly cropped image.

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