: How to create a donut shaded with a gradient We need to create a donut (=a torus) with a gradient along its length Basically we want to take this rectangle and wrap it around and make

@Samaraweera207

Have you perhaps thought about trying Inkscape(dot)org - like GIMP it's also free and Open Source.

Draw a circle, set a wide stroke size, no fill, colour the stroke blue.

Copy it, and Paste in Place, then colour the stroke black, reduce the width of the stroke, and apply some blur.

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@Turnbaugh909

You can apply a radial gradient to the stroke of a vector layer in Photoshop.



Or a reflected gradient as a layer style stroke using the Shape Burst option:



. . . the Layer style is a bit easier to apply and edit if necessary.

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@Becky351

Make a three stop radial gradient and fill your ring with it. (I'll add soon images)

ADDENDUM That was actually not a good idea, because the same method is meanwhile appeared in another answers. Here's something else:


Have a square image with a white layer. Let the image have pixel dimensions 200% of the wanted ring diameter. Draw a horizontal rectangular selection just at the middle of the image and fill it with black





Let the selection stay, make a gaussian blur, so heavy that the black just lightens a little in the middle, too. The blur is now a gradient.





Let the selection stay. Take the curves tool and adjust the steepness of the gradient to resemble a straight tube:





Remove the selection Goto Filter > Distort > Polar coordinates > Rectangular to Polar





Take the magic wand. Select the white and press DEL. Be sure you have the tolerance = 0 or 1 and antialiasing =ON. Before deleting you can goto selection menu and contract the selection if you want to save more white. Otherwise the pure white is removed.




ADD2: I just read you are programmers. Then you should have no problems to implement the following radial brightness:



Bx = Brightness (0...255) at the edge

Bm = Brightness at the middle of the ring

R1 = internal radius

W = radial width of the ring

h = roundness exponent, positive, start with h=1

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