Also something I noticed when researching this, besides altering the frame shape and adding a border around it, macOS 26 will do edge detection on the app icons and will add effects like gradient and shine to them.
If you open the app package properties and copy the icon from there, you will get the icon with system effects baked into it, not the source icon stored in the package.
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Green Broadcasting In macOS 26 Apple enforced the squircle shape for app icons. If an icon doesn't match the new format, it gets "plated" with a gray background. I noticed that a few apps that weren't updated for a while had their icons shown without extra plating. This surprised…
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