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I want to get a circular image from a rectangle image. You can see the image below, please. enter image description here

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    use the circle select tool. then invert selection. finally cut the back out. – ravery Feb 6 '18 at 14:12
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    ... as explained in this tutorial Making a circle-shaped image – steeldriver Feb 6 '18 at 14:24
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    Guys, you could make your comment elaborate and instead post an answer too. – Yufenyuy Veyeh Dider Feb 6 '18 at 16:14
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First things first, there is actually nothing as a circular image. Images that appear circular are due to the fact that the corners are made transparent and shaped such that a circle is portrayed.

With that clarification, I believe you have a clue about what you will do.

So you can go about it as follows:

First, make sure that your layer has an “alpha channel”.

Layer → Transparency → Add alpha channel

If it’s greyed out it means you already have one

enter image description here

  • Create a circular selection with the “Ellipse select tool” (the 2nd one in the toolbox).

enter image description here

Use the “Tool options” dialog

Windows → Dockable dialogs → Tool options

enter image description here

a) If you want a true circle, use the Fixed option: select Aspect ratio and enter 1:1.

b) Depending on what kind of marks you have, you can use:

i) The diagonal framing (default): click on one corner, drag across a full diagonal and release at the opposite corner.

ii) The radial framing (check Expand from center in the Tool options): click on the center, drag across a half diagonal release on a corner.

  • If the selection isn’t perfect on the first try, you can move it (click around the middle) or extend it (click inside, near a border or a corner).

  • Once you have the required selection, invert the selection (Select → Invert, or Ctrl-I) so that everything is selected, except your circle.

  • Erase the selection (Edit → Clear or [Delete] key). You should have your central circle left, surrounded by a checkerboard pattern. (this checkerboard is not part of the image, it just indicates the transparent parts of the image).

  • You can reduce the checkerboard to the minimum by auto-cropping the image (Image → Autocrop image)

  • Last, save the image in a format that supports transparency, like PNG (JPEG doesn’t support transparent images…)

  • If you are going to work further on the picture, save it as XCF (Gimp native format).

You may equally visit this link for more clarification: https://www.gimp.org/tutorials/CircleImage/

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    While this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – Thomas Ward Feb 6 '18 at 16:16
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    @YufenyuyVeyehDider It is better to give solution without providing solution's link. – alhelal Feb 6 '18 at 16:18

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