Step One
First of all, create a new canvas, 500×500 pixels with a white background, and then open a random picture of anything (I used this - click)
Step Two
Now make a one-pixel horizontal selection, (anywhere on your image) and drag it vertically (ctrl+t) - then take a selection that you think looks nice, as shown to the left.
Now cut this (ctrl+x) and paste it into the new document that you created (on a new layer).
Next, press ctrl+t and drag hold alt and drag the left edge of the bounding box to the end of the canvas.
Step Three
You should now have something resembling that to the left, depending on what image you used.
Step Four
Next, do a polar co-ordinates filter (filter–distort–polar coordinates) and select Rectangular to Polar, which should give something like that to the left.
Step Five
Now switch snap on (view–snap) and turn on rulers (view–rulers) and drag some guides out, and they should snap into place as shown to the left.
Now select the topright, topleft and bottom left sections, and delete them, as shown in the image to the left.
Step Six
Now switch snap on (view–snap) and turn on rulers (view–rulers) and drag some guides out, and they should snap into place as shown to the left.
Now select the topright, topleft and bottom left sections, and delete them, as shown in the image to the left. (click to enlarge)
Step Seven
Now, simply do the same thing to the left edge of the curve, and you have our final result, as shown to the left.)
