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Turn the verified-text fidelity anchor off by default

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The whole-frame 15% Qwen-VAE blend returned detector-visible OpenAI
SynthID on poster-scale manifests through the engine text-manifest
path (official Content Provenance API, 2026-08-19: restored detected
x6 with the anchor, clean x6 without it; base outputs clean x6;
pixel-identical stripped controls detected, proving the pixel channel).
Add fidelity_anchor=False to remove_watermark and InvisibleOptions and
--fidelity-anchor on the CLI to reproduce the 0.27.0 research
behavior. Text-box MAE cost of the new default is under one point on
all three fixtures (11.60->11.72, 7.79->7.86, 7.57->8.13).
This commit is contained in:
Victor Kuznetsov
2026-08-18 21:23:25 -07:00
parent 50d9f44829
commit 42d427731f
12 changed files with 109 additions and 6 deletions
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docs/cli.md
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@@ -416,6 +416,12 @@ remove-ai-watermarks invisible image.png -o clean.png \
--pipeline qwen-zimage --text-manifest verified-lines.json --force
```
Since 0.27.1 the global 15% Qwen-VAE fidelity-anchor blend is off by default: it
was measured to return detector-visible OpenAI SynthID on poster-scale manifests
(official Content Provenance API, 2026-08-19). `--fidelity-anchor` restores the
0.27.0 research behavior; text-box fidelity lost by the default is well under one
MAE point on the measured fixtures.
The manifest is a JSON object with `schema_version: 1`, `verified: true`, decoded
RGB dimensions, `source_pixel_sha256`, and a non-empty `lines` array. Each line has
an integer `[x1, y1, x2, y2]` box, exact `text`, a non-empty `script`, and an optional