mirror of
https://github.com/wiltodelta/remove-ai-watermarks.git
synced 2026-07-06 16:37:49 +02:00
Victor Kuznetsov
e572767555
Visible-watermark work across all three corner-mark engines plus a committed,
reproducible alpha-build pipeline (scripts/visible_alpha_solve.py) fed by committed
solid black/gray/white captures.
- jimeng: new "即梦AI" wordmark remover (reverse-alpha + thin residual inpaint,
always NCC-aligned -- the mark re-rasterizes/jitters per image). Detect via glyph
silhouette NCC (0.45 threshold; does not cross-fire with Doubao). Registered in the
visible-mark catalog; `visible --mark jimeng` / `--mark auto`.
- doubao: fix a real production defect -- the shipped remover left a READABLE
"豆包AI生成" outline on real samples while detect() returned conf 0.0 (fooled by a
thin outline), so the test passed and the "56/56 clean" claim was detector-measured,
not visual. Root cause: under-estimated alpha + fixed-geometry-no-inpaint + tight
locate box. Rebuilt alpha (careful gray-self solve), always-align, thin inpaint,
widened locate box -> readable outline becomes faint texture-level traces.
- gemini: rebuild gemini_bg_{96,48} from our own controlled captures (validated NCC
0.9998 vs the prior third-party asset); removal re-verified clean, no behaviour change.
- tests: add textured-shift regression to both engines (guards the align-on-shift path
the Doubao defect exposed; lesson: a detector-only removal test is insufficient,
assert visual residual).
- docs: CLAUDE.md, README, capture READMEs and docstrings synced; stale
"exact/pixel-exact/56-clean" claims removed.
Also includes a SynthID label-wording clarification in identify.py/cli.py
("SynthID pixel watermark" -> "SynthID watermark, inferred from C2PA metadata").
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
88 lines
4.6 KiB
Markdown
88 lines
4.6 KiB
Markdown
# Doubao visible watermark capture
|
|
|
|
> **Status (captured 2026-05-29; alpha rebuilt 2026-05-31):** the black/gray/white captures were
|
|
> taken and are now **committed** in `captures/` (solid colour + watermark, content-free). The alpha
|
|
> map is rebuilt by `scripts/visible_alpha_solve.py doubao` (the careful gray-self solve shared with
|
|
> Jimeng). The first build claimed "pixel-exact" but left a readable outline on the real sample (issue
|
|
> #13 follow-up); removal now reverse-alphas, NCC-aligns, and applies a thin residual inpaint. See the
|
|
> `doubao_engine.py` notes in the root `CLAUDE.md`. The text below is kept as the historical capture plan.
|
|
|
|
Goal: capture the Doubao "豆包AI生成" visible watermark over known flat backgrounds so we can
|
|
build a per-pixel alpha map and a reverse-alpha-blend remover, the same way the Gemini sparkle
|
|
engine works (`src/remove_ai_watermarks/gemini_engine.py`).
|
|
|
|
## What we already know (verified from prior art, 2026-05-26)
|
|
|
|
- Blend model: **alpha compositing with a white logo** `watermarked = a*logo + (1-a)*original`,
|
|
`logo = (255,255,255)`. Inversion: `original = (watermarked - a*logo) / (1-a)`.
|
|
Confirmed by two independent sources (an open-source remover's algorithm doc + aiwatermarkremover.dev,
|
|
both say "alpha map"). One commercial blog (pixelcleanai) claims "screen blend" instead; the gray
|
|
capture below settles it empirically.
|
|
- Position: **bottom-right corner**, small margins (right ~8-20px, bottom ~5px), scales with image size.
|
|
Confirmed by our sample `data/samples/doubao-1.png` (2048x2048) plus three sources.
|
|
- Size **scales with resolution**. Third-party numbers (~90x18 at <=1024, ~180x40 at >1024) are
|
|
approximate and calibrated for ~1024-1280 outputs; at 2048 the strip is much larger. A shipped
|
|
third-party alpha map is only 120x20, too small for our 2K/4K target -> capture fresh.
|
|
- The planning assumption was that clean inversion leaves residue on textured backgrounds, so the
|
|
remover would pair the alpha map with inpainting. After the capture this turned out unnecessary at
|
|
the native width (recovery is pixel-exact there and inpaint is off); the shipped remover is
|
|
reverse-alpha only, with a residual inpaint applied off-native only.
|
|
|
|
## Use doubao.com specifically
|
|
|
|
The "豆包AI生成" mark is Doubao's. Jimeng / Dreamina use a different mark. Generate on doubao.com so
|
|
the captured template matches our target.
|
|
|
|
## How to capture (image-edit path, most reliable)
|
|
|
|
For each seed in `seeds/`:
|
|
|
|
1. Open Doubao image generation, use the image-edit / reference mode, upload the seed.
|
|
2. Prompt (Chinese preferred):
|
|
`请完全按照原图重新生成这张图片，保持完全一致，不要添加或修改任何内容`
|
|
(English: `Recreate this image exactly as it is, keep it identical, do not add or change anything`)
|
|
3. Download the ORIGINAL output file (not a screenshot). Do not crop / edit / re-save.
|
|
|
|
Prior art confirms uploading a pure-black image and letting Doubao stamp it works.
|
|
|
|
If edit mode is unavailable and text-to-image refuses a solid color, fall back to generating 10-12
|
|
normal-content images at one fixed resolution; the mark is the only constant across them and can be
|
|
extracted by per-pixel min/median.
|
|
|
|
## What to capture (priority top to bottom)
|
|
|
|
| Aspect | black | white | gray128 | why |
|
|
|--------|-------|-------|---------|-----|
|
|
| 1:1 | 3 | 1 | 1 | primary alpha map + confirm the stamp is pixel-identical across runs + settle blend mode |
|
|
| 16:9 | 2 | 1 | 1 | anchor rule in landscape |
|
|
| 9:16 | 2 | 1 | 1 | anchor rule in portrait |
|
|
| 4:3, 3:4 | 1 each | - | - | optional, refines anchor rule |
|
|
|
|
- 3 blacks on 1:1: if the first two are byte-identical in the watermark region, the third is optional.
|
|
- gray128 is the blend-mode test: predict the gray result from the black capture under alpha vs screen;
|
|
whichever matches the real gray output is the true blend.
|
|
- If the UI offers multiple output resolutions (1K / 2K / 4K), capture one black per resolution on 1:1 -
|
|
needed to learn how the watermark scales.
|
|
- Also grab 3-5 normal-content images on 1:1 for end-to-end removal validation.
|
|
|
|
## Hygiene
|
|
|
|
- Original download, never a screenshot. PNG preferred; if Doubao only gives JPEG, note it.
|
|
- No crop / edit / re-save. Default settings, watermark left ON.
|
|
|
|
## Naming, drop into `captures/`
|
|
|
|
```
|
|
doubao_black_1x1_1.png
|
|
doubao_white_1x1_1.png
|
|
doubao_gray128_1x1_1.png
|
|
doubao_black_16x9_1.png
|
|
doubao_content_1x1_1.png
|
|
```
|
|
|
|
## Also report back
|
|
|
|
1. Which resolutions and aspect ratios the Doubao UI actually offers.
|
|
2. Whether there is a watermark on/off toggle in the UI.
|
|
3. Download format (PNG or JPEG).
|