Drag & drop your night-sky photo
Choose a photo JPEG · PNG · WebP · TIFF · BMPPreparing the photo engine — one-time, a few seconds…
How it works & why it's private
Everything runs inside your browser tab: scientific image processing compiled to WebAssembly,
with no server and no upload. The pipeline flattens the light-pollution gradient, denoises color
and luminance while protecting point stars, lifts faint stars, then applies a black-point cut
and a gentle asinh stretch — the same maths used for telescope imagery.
Don't take our word for it — read the source on GitHub.
See the difference
A real handheld phone photo — drag the slider to compare
