The Pinch, Spherize, and ZigZag filters are lumped together, not so much because they do the same thing but because their interfaces are so similar. Figure 17.7 shows the dialog box for the ZigZag filter.
The ZigZag filter dialog box.
Keep an eye on the grid provided at the bottom of the box as you drag the Amount slider higher or lower. It can give you a good indication (as can the preview area) of what is going on in the image. See the final version in Figure 17.8 and in the Color Gallery. It turned the chain into a pool of melted iron.
This is a tough filter to master, but a good one to have in your bag of tricks. The Spherize filter can be very useful on occasion, but don't try to force it. If it doesn't look right, you can try Liquify to create a similar "bubble" effect. Also, you can set a negative amount using the Amount slider to generate a hollow instead of a bump. And if this doesn't satisfy your needs, try the Pinch or ZigZag filters.
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