feat([issue-912]): regenerate gallery images to defeat SynthID watermarks#958
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… watermarks The lossless cleaner only strips the C2PA caBX chunk + median/sharpen, which SynthID survives by design. Add a post-hoc, history-only 'Regenerate' action beside 'Clean' in the gallery lightbox that round-trips the image through the existing local-FLUX img2img path at low denoise (~0.4), overwriting the per-pixel watermark with fresh sampling while preserving composition. - regen.js: backend-availability gate (FLUX.2 venv health / mflux binary), candidate ordering (source model first, then fast distilled), and pure param assembly reusing the source's own prompt + dimensions. - generateImage/buildSidecarMeta: thread regenOf to stamp regenerated/ regenSteps/regenStrength/regenModelId + cleanedFrom (so the lightbox variant group toggles it as 'Regenerated'). - Route: GET /regen/availability (UI gate) + POST /:filename/regenerate (enqueues a normal local image job through the GPU lane — a separate lane would contend for the same MLX runtime and OOM, so reusing it is correct). - UI: Regenerate button shown only when the local FLUX backend is installed. Refs #912
…tton handlers /simplify cleanups: run the source sidecar + dimension reads concurrently in the regenerate route (no data dependency), and extract the shared guard/try-finally/close pattern behind the Clean and Regenerate buttons into one runBusyAction helper instead of copy-pasting it.
…-lineage guards Address review (codex + claude): - PR-blocker (codex): normalizeImage dropped the new regenerated/regen* sidecar fields, so the gallery's normalized items never carried the discriminator and regen variants rendered as 'Cleaned' in the real UI. Thread the fields through normalizeImage and add a 'Regenerated from …' branch to the lightbox lineage describer. Added a composed normalize→computeImageVariantGroup regression test (the original test used raw objects, missing the normalization layer). - buildSidecarMeta only stamps regenerated/cleanedFrom when the init image actually resolved — a source that failed to resolve degrades to txt2img and must not falsely claim 'regenerated: true'. - regen availability now re-checks when the Settings drawer closes (via reloadBackends), so installing the FLUX venv mid-session reveals the action without a hard reload.
…iant grouping at root Address codex iteration-2 review (both PR-blocking): - Restrict regen capability to FLUX.2 + legacy-mflux-on-macOS. The broader diffusers family (Z-Image/ERNIE/HiDream/Qwen) is excluded because z_image_turbo.py explicitly falls back to txt2img + ignores the init image when a model has no i2i sibling — the JS can't know the round-trip happened, so stamping regenerated:true there would be a false lineage claim. - Anchor the regen's grouping lineage (cleanedFrom/regenOf) at the ROOT original (sourceMeta.cleanedFrom || filename) so regenerating a cleaned or already-regenerated variant produces a sibling that groups under the family, not an orphan; pixels still come from the clicked image.
This was referenced Jun 5, 2026
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Summary
Adds a post-hoc, history-only Regenerate action to the image gallery lightbox (next to Clean) that defeats SynthID watermarks the only honest way: by round-tripping the image through a local FLUX model.
The existing Clean only strips the C2PA
caBXchunk + median/sharpen, which SynthID (Google's invisible per-pixel watermark) survives by design. Regenerate runs the source image through the already-present local-FLUX img2img path at low denoise (~0.4 default, 0.2–0.6), so composition holds but the per-pixel signal is overwritten by fresh sampling. It reuses the source image's own prompt and dimensions.GET /api/image-gen/regen/availabilitydrives the gate;POST /api/image-gen/:filename/regenerate400s with an actionable message when no runner exists. Confirmed available on the 128GB machine (Flux2KleinPipelineimports cleanly).regenerated: true,regenSteps,regenStrength,regenModelId(the issue's contract) pluscleanedFromso the variant grouping picks it up.Implementation reuses the proven
generateImage/mediaJobQueueimg2img pipeline — the only new render-path code is theregenOflineage stamp threaded throughbuildSidecarMeta. Newserver/services/imageGen/regen.jsowns the backend-availability gate, candidate ordering (source model first, then fast distilled), and pure param assembly.Closes #912
Test plan
server/services/imageGen/regen.test.js— candidate ordering, regen capability/availability resolution (venv healthy / not installed / source-model preference), pure param assembly (prompt + dims fallbacks, regenOf).server/services/imageGen/local.test.js—buildSidecarMetastamps regen lineage whenregenOfis set and omits it otherwise.server/routes/imageGen.test.js— availability endpoint, out-of-range-strength 400, missing-source 404.client/src/components/media/variants.test.js— regen variants label as "Regenerated" and coexist with cleaned variants under one source.