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Making a circle-shaped image with gimp what can used as app icons
31.03.22
Making a circle-shaped image There are no circular images. There are only rectangular images. But there can be images where corners are transparent, so that only a circle shows. In light of this: First, make sure that your layer has an “alpha channel”. Layer → Transparency → Add alpha channel if it’s grayed out it means you already have one GIMP Add Alpha Channel Dialog Create a circular selection with the “Ellipse select tool” (the 2nd one in the toolbox). GIMP Ellipse Select Tool Use the “Tool options” dialog Windows → Dockable dialogs → Tool options GIMP Tool Options If you want a true circle, use the Fixed option: select Aspect ratio and enter 1:1. Depending on what kind of marks you have, you can use: The diagonal framing (default): click on one corner, drag across a full diagonal and release at the opposite corner, 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).
https://www.gimp.org/tutorials/CircleImage/
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