Full Meta Muse Image support in the invisible-removal path:
- QWEN_ZIMAGE_META_STRENGTH = 0.1: derived by the standard
worst-boundary-plus-cross-source-spread method over five oracle-bracketed
generations (data/contentseal/manifest.csv)
- Auto mode: vendor_for_strength routes a file whose only provenance is the
standalone AI IPTC trainedAlgorithmicMedia tag onto the meta cohort; C2PA
issuers win first, so Google/OpenAI/Microsoft routing is unchanged. Muse
WebP outputs place the XMP in a tail chunk, so the scan uses the shared
chunk-aware metadata.scan_head rather than a plain head read
- Explicit override: --vendor on invisible/all/batch and
InvisibleOptions.vendor name the cohort on stripped files; naming a cohort
asserts the watermark is present, so the no-signal gate treats it like
--force at both the CLI and API seams
- sdxl-zimage has no measured Meta rung: an explicit meta vendor falls to
the conservative unknown 0.25 rather than inventing one
- identify emits a Content Seal caveat pointing at the removal path
- The legacy visible 'Imagined with AI' mark stays unregistered: a dedicated
sample hunt (newsroom mockups, community posts, press screenshots, dead
imagine.meta.com, broken Wayback captures) found no pixel-verifiable
capture, and the registry rule forbids encoding a corner without one.
erase --region remains its removal path; outcome recorded in the landscape
Co-Authored-By: Claude Fable 4.5 <noreply@anthropic.com>
Muse Image (muse-image-1.0, Meta Superintelligence Labs, 2026-07-07) ships
every output with Content Seal, a proprietary invisible pixel watermark, and
no visible mark. Establish support documentation and a verified corpus:
- data/contentseal/: five own generations via the Meta Model API, every
oracle verdict recorded in manifest.csv (44 rows, settled-text protocol,
fresh-navigation variant for calibration rows)
- Oracle: meta.ai/identification web tool only; no API endpoint exists in
the Meta Model API (verified against dev.meta.ai/docs); internal REST
pair documented with its server-side sliding-window rate limit
- Removal: default qwen-zimage profile clears Content Seal (oracle-verified
on the worst source); strength floor derived at 0.1 by the standard
worst-boundary-plus-cross-source-spread method, recorded but not encoded
as a constant since no provenance signal routes Muse output onto a vendor
cohort
- Seal robustness measured: survives resize, JPEG q85, metadata stripping,
CDN WebP transcode; dies to center crops and diffusion regeneration
- tests/test_contentseal_corpus.py guards manifest integrity
Co-Authored-By: Claude Fable 4.5 <noreply@anthropic.com>
