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Create a new image 500 pixels by 10 pixels high
Filter>Noise>Add Noise: 30, Guassian,
monochrome
Image>Map>Threshold (Cmd-T): 200
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Image>Image Size: uncheck proportions and
change to 500 x 500
Edit>Select All (cmd-A)
Edit>Copy (cmd-C)
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Edit>Paste (cmd-V)
Image>Rotate>90° CW
Set the floating layer mode to Multiply in the Layers
Palette
Select>Deselect (cmd-N)
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Image>Map>Invert (cmd-I)
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Filter>Distort>Shear: move the top point
over a bit
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Image>Rotate> 90° CW
Apply the filter again (cmd-F)
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Using the gradient tool, apply a graduate top to
bottom, black to white, multiply
Click and hold at the very top of the image and
drag to the very bottom while holding the shift key (the
shift key constraints the gradient). Release the mouse
button.
Click and hold at a few pixels from the bottom of
the image and drag up a few pixels while holding the shift
key. Release the mouse button. This changes the bottom
edge to black. This will prevent streaks from when you apply
the final Polar filter. Try it without to see the
difference.
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Filter>Blur>Blur
Image>Map>Levels (cmd-L)
Set the midrange value to 2
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Filter>Distort>Polar
Coordinates>Retangular to Polar
It's a breeze!
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