Optical Removal treats thin high-contrast image edges as hairs, even at Threshold 1.00 / Size 3

[ToddSch1979]

NegPy version / build

NegPy v0.58.0

OS

Mac OS 26.6.2

Scanner

Digital camera (macro/copy setup)

Scanner model / details

D800 NEF

Light source

Big Scanlight, Trichrome camera scan Narrowband + LinearRaw, no IR plane.

Correction mode

On (narrowband trichrome correction enabled)

Input ICC profile (if any)

NA

Relevant process-tab settings

NA

What happened

With Optical Removal on and Overlay: Marked, thin high-contrast edges that are part of the image get marked magenta (structure-following fill) and repaired out. Shape doesn't matter: straight court lines and window mullions are caught, and so are curved leaf rims. It looks driven by edge contrast, not geometry. Checked at 1:1 with the Overlay off: no trichrome registration fringing on these edges, and Overlay: IR shows nothing, since there's no IR plane.

• Frame 170, tennis court: every white court line, plus a roofline. Threshold 0.32 and 0.96, Size 4 px. Same result at both.
• Frame 166, window mullions against a bright window. Threshold 0.96, Size 4 px.
• Frame 139, foliage: bright leaf rims marked magenta, leaf texture marked green. Threshold 1.00, Size 3 px, the most conservative the sliders go. Repair readout: painted 0.13%.

What looks off:

1. Threshold has little effect on line detections. Same result from 0.32 to 1.00.
2. The court lines are several times wider than the 4 px Size cap but still get caught. Anything line-shaped seems to bypass Size and go to the wide fill.
3. Frame 139 is busy detail, where the docs say the threshold rises. It still catches edges at max threshold.

Expected: real image lines and edges survive at conservative settings. An exclusion mask, or tying max line width to Size, would fix it.

Suggestion: split Optical Removal detection into two checkboxes, "Spots" and "Lines/Hairs", both on by default. On frames with strong image edges you could run spot removal alone and handle the occasional hair with the Scratch or Transport Line tools. Better line discrimination is the real fix, but this would make auto dust removal usable on those frames in the meantime.

Screenshots of before/after attached, along with links to triplets.

Source file

Frame 170 an d139: https://SchweiNas.synology.me/SchweiDrive/d/s/19paByP7mYJ7UOlhabpr1doNVMrdd9lT/B75js-vaUijNFfPR1Lj28HJzietU7rpQ-0LYg5BGlfg0

Screenshots

Frame 170

Frame 139 (Overlay Off / Overlay Marked / Optical Removal on)

[marcinz606]

I'll look into better/more aggresive thresholding because otherwise I think the inpainitng aspect is pretty good at the moment

[ToddSch1979]

The inpainting is AMAZING, def keep that and well done on that.

[marcinz606]

I'm making the slider behaviour slightly stronger/different above default 0.66