Twinkle Stars
Upload your sky photo or paste a URL. The app finds bright local maxima in the sky region and renders twinkles at those positions. The image stays raster.
Image file
Or image URL
Load URL
Use Haleakalā sample
Detect stars
Pause
Brightness threshold
Local max radius (px)
Min distance between stars (px)
Max stars
Sky cutoff from top (%)
Ground cutoff from bottom (%)
Glow radius (px)
Twinkle speed
Tip: raise the bottom cutoff to exclude clouds and horizon.
Detected stars:
0
Save current frame
Render GIF