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Horizontal strip to semicircular arc.

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Convert a horizontal strip to semicircular arc.


Plugin needed - Polar Transformation

Image used:


This example image is 1024 X 341.


Open the image in paint.net.

Expand the canvas to a square with dimensions of twice the horizontal pixels of the original image, anchored bottom-center.


Magic Wand the alpha.

Invert selection.

Make the Move Selected Pixels tool active.

Move the selected pixels up 1 pixel using the up-arrow key on the keyboard.

Now grab the top-center Control Nub and stretch the selected pixels to 4 times their original height.




Apply the Polar Transformation plugin set to:
Transform rectangular to polar.



Resize the image to 50%.




If you wish to invert the arc:
Image > Flip Vertical



Edited by ardneh
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