Figure 11-33: Two familiar circular images (left) converted from polar to rectangular coordinates (right). The top example is simple enough that you can probably predict the results of the conversion in your head. The lower example looks cool, but you'd need a brain extension to predict the outcome.
Tip The Polar Coordinates filter is a great way to edit gradations. After drawing a linear gradation with the gradient tool (as discussed in Chapter 6), try applying Filters Distort Polar Coordinates with the Polar to Rectangular option selected. (Rectan gular to Polar just turns it into a radial gradation, sometimes with undesirable results.) You get a redrawn gradation with highlights at the bottom of the selection. Press Ctrl+F to reapply the filter to achieve another effect. You can keep repeating this technique until jagged edges start to appear. Then press Ctrl+Z to go back to the last smooth effect.
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