What's the best tool to snip out corners

[clawson]

GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: Basic Level

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Cutting Corners, Gimpless

[ofnuts]

Layer>Transparency>Add alpha channel. Then you should be able to make the corners transparent (of course, save as PNG).

OTOH, this image is terribly blurry, I assume you upscaled a smaller image?

[Nidhogg]

If you have a circle, it's easy to use (add alpha first) circle selection tool, invert, delete.
But, seeing the quality of that image:

a.) remake it in high resolution.
b.) download from wikipedia. There's also a .svg version that's more useful.