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Horizontal strip to semicircular arc.


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Posted (edited)

Convert a horizontal strip to semicircular arc.

 

Plugin needed - Polar Transformation


Image used:

O09c8Y.png

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.
 

O09ELc.png

Magic Wand the alpha.


Invert selection.
Ctrl+I
 

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.
 

O09UvJ.png

Deselect.

 

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

O09DFO.png

 

Resize the image to 50%.

 

O09z08.png

 

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

 

 

Edited by ardneh
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