✨ Reverse Alpha Compositing
Gemini Visible Sparkle Watermark Remover
Restore the original image pixels beneath the visible Gemini sparkle watermark using mathematical reverse alpha compositing. 100% in-browser, privacy-first, zero uploads to external servers.
How Reverse Alpha Compositing Works
// Compositing equation:
W = α × L + (1 - α) × O
// Reverse reconstruction:
O = (W - α × L) / (1 - α)
Where W is the observed watermarked pixel, L is the watermark color ([255, 255, 255]), α is the ground-truth opacity map, and O is the reconstructed original image pixel.