Red-Eye & Pet-Eye Remover

Two glowing eyes, two different physics

Human red-eye is the camera flash lighting up the blood-rich retina and bouncing straight back at the lens. It is reliably, predictably red.

Animal eyeshine is a different thing entirely. Cats, dogs and most night-adapted animals have a reflective layer behind the retina — the tapetum lucidum — which exists to give them a second chance at scarce light. It throws back green, gold, blue or a blown-out cyan-white, and it is far brighter than anything a human eye does.

A tool built only for red will not touch a green-eyed dog. There is a Person/Animal switch here because these genuinely need different handling.

Why clicking works

You click the glow and a two-stage flood fill spreads outward from that point. The first stage is strict — it only starts on genuine shine. The second follows the fading rim out to the iris edge using a "cool, not warm" test.

That second rule is the one that makes it usable. Almost every false-positive surface in a photograph — skin, lips, fur, a red shirt — leads with red. Eyeshine leads with green or blue. Testing for the cool channel keeps the fill inside the eye instead of bleeding across a face.

Scroll to zoom and drag to pan first. A pet's eye in a wide shot can be a dozen pixels across, and precision beats patience.

What it cannot do

It darkens the glow to a natural pupil tone and preserves the catchlight, so the eye still looks alive rather than like a hole.

If an eye is completely blown out to white, there is no detail underneath to recover. The honest result there is a clean dark pupil, not a reconstructed eye — no tool is retrieving information the sensor never recorded.