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It's simple to convert a square picture to a
round picture by simply making a circular selection and adding a
mask. However, how about converting a square image to a sphere?
Here's a trick to keep things looking good.
1. Open a square image in Photoshop or crop an image to a
square. (If the image has layers, flatten or merge the layers to
apply the effect to the image as a whole.)
2. Image> Canvas Size. Increase the size of the
canvas to 150%. (We're using PhotoSpin's image #0370029.)
3. Filter> Distort> Spherize. Drag the slider
all the way to the right and leave the pop-up menu set to
Normal.
4. The resulting image isn't completely round,
so use the keyboard shortcut Command-F (Mac) or Control-F
(Windows) to apply the filter again with the same settings.
5. Image> Image Size can reduce your image to
the original size. Check the Constrain Proportions and Resample
boxes. In the upper part of the dialog box, switch from Pixels
to Percent. Enter 66.67% and click OK. Here's a comparison of
the before and after images.
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