(09-30-2017, 03:18 PM)Nisko Wrote: In other words, how is a png file different from a jpg file? Is it possible that the app I want to place the finished product in doesn't support a png file?
A jpg file does not support transparency. A png does. What sort of app will you use for your finished image?
I did this, with screenshots. Blighty gave the same procedure so not required but if you get stuck, have a look.
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Lots of screenshots so not inline:
1. You might want to add transparency, an alpha channel to your image: https://i.imgur.com/6TOIgxr.jpg
2. Use the elliptical selection tool. To create a circle, several ways but the most obvious is set the aspect ratio to 1:1
2a. The selection is resized on the canvas using the 'handles' that appear on sides and corners.
2b. Click and drag to move the selection around. https://i.imgur.com/sUYdmaI.jpg
3. That selects inside the circle so now invert the selection. https://i.imgur.com/pFNgoYl.jpg
4. Cut that bit of the image out: https://i.imgur.com/5JAW65c.jpg
5. You might want a new background. Might be a new layer underneath or Export the image as a png to preserve transparency. https://i.imgur.com/4jhDbXe.jpg
5b. Or with your new background image already open, File -> Open as Layers the circular-cut-out png image.