Image Watermark Removal Settings Guide

Confidence needed to trust the default position and skip the scan.

If the match score (normalized cross-correlation) at the standard corner is at or above this, the tool trusts it and skips the slower sliding-window search. Higher = stricter and more thorough (more scanning); lower = faster but risks accepting a weak match.

Minimum match score before a watermark is declared “found”.

Below this, the tool reports no watermark and leaves the image untouched. Lower it to 0.20–0.25 when faint or low-contrast watermarks are being missed; raise it to prevent false positives on already-clean images.

Step size of the coarse search for a moved watermark.

Smaller strides search more positions — slower, but they catch stamps sitting off the usual grid. 8 px balances speed and accuracy; drop to 2–4 px for stubborn clips where the watermark has clearly shifted.

Fine ± search around the coarse peak for the exact position.

After the coarse pass finds a rough spot, this does a pixel-by-pixel refine within the given radius so the mask lands precisely. A larger radius means more precise placement (cleaner removal); set it to 0 to disable the refine entirely.

Grows or shrinks the treated area around the detected stamp.

Detection always uses the calibrated size; only cleanup uses this scaled map. Nudge it to 1.10–1.40× if you see a faint halo of fringe glow left around where the watermark was. Too high starts softening clean pixels next to the stamp.

Correction strength when the stamp has moved from its usual corner.

When Gemini shifts the watermark away from the expected bottom-right margin, the reverse-blend applies this gentler gain (video-calibrated) to avoid over-darkening. Raise it toward 1.0 if a moved watermark is not fully removed; lower it if drifted removals look too dark.

Caps how hard near-opaque pixels are corrected.

The reverse-blend divides by (1 − opacity), which can blow up as opacity approaches 1. This ceiling keeps that division stable. Lower it slightly (about 0.95) if bright specks or artifacts appear where a very solid part of the watermark used to be.

Ignores pixels the watermark barely touches.

Pixels whose watermark opacity falls below this are skipped during the reverse-blend, since they are essentially unaffected. Raise it to leave near-transparent fringe alone; lower it to also treat the faintest edges. The default is safe for almost every image.

Which calibrated sparkle map to reverse-blend against.

Pick “New (2026)” when you are cleaning the redesigned Gemini sparkle, and “Original” for older captures. If the watermark shape does not match the map, removal leaves a faint residue — switch versions before touching anything else.

The assumed brightness of the watermark colour.

255 means pure white, which matches most Gemini sparkles. If your watermark is off-white or light grey and is not coming off cleanly, lower this to match its actual brightness so the maths subtracts the right colour.