The Wave filter offers more than a dozen controls you can use to specify how your image is roiled up. There are three kinds of waves, and you can choose the number, size, and frequency of the ripples. The key controls include:

• Number of Generators. Or the number of points where waves are created, up to 999 (but that's far too many for most images). The effect is so muddled that each wave may be only a pixel or two wide. In my tests, high numbers ended up producing areas with plain tone, and no waves at all! You'll want to use from 5 to 20, tops.

• Wavelength Minimum/Maximum. Sets the distance from one wave crest to the next. What's the frequency, Kenneth? In this case, wavelength minimum and maximum (from 1 to 999) refer to the number of individual waves produced by each generator.

• Amplitude Minimum/Maximum. Controls the height of the waves, from 1 to 999.

• Horizontal/Vertical Scale. Adjusts the amount of distortion provided by each wave, from 1 to 100 percent.

• How Undefined Areas Are Filled In. Pixels can wrap around from one side to another, or stretch from the edge to fill the empty spaces.

• Type of Wave. Smooth sine waves, sharp triangle waves, or blocky square waves.

• Randomize. Applies random values to your wave's parameters. Zigzag

The Zigzag filter is excellent for producing ripples in an image. You don't actually get zigzags at all with most settings. Choose the amount of distortion from 100 to +100 and the number of ridges from 1 to 20. You may also select pond-type ripples, ripples that emanate from the center of your selection, and whirlpool-like ripples that revolve around the center of the selection in alternating directions. The Zigzag filter is a good choice for creating any type of water effect, assorted liquids, and special textures. Figure 8.35 shows the Wave and ZigZag filters at work.

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