Upsies is something I wrote on a whim, just out of curiosity if it worked – using the MetalFX Spatial Upscaler to upscale photos and images. And lo and behold, it does work, and produces arguably nicer results than, say, resizing an image up with

It’s a freeware app, available for download on the Mac App Store (with optional tipping).
It requires macOS 14 Sonoma, and a MetalFX Spatial Upscaler-capable Mac.

Enjoy : )

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