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fix(invisible): raise default strength 0.10 -> 0.30 (current SynthID threshold); flag ctrlregen experimental

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An oracle-verified GPU strength study (Modal A100, native res, Gemini-app
'Verify with SynthID', n=3 fresh Gemini images, protect_text/faces off) found the
current Google SynthID survives strength 0.10/0.15/0.2 and is removed only at 0.3.
The previous 0.10 default (set from an n=1 result) no longer clears it -- Google
hardened SynthID and the threshold has climbed 0.05 -> 0.10 -> ~0.3. Bump
DEFAULT_STRENGTH to 0.30; OpenAI/ChatGPT carry C2PA not SynthID, so 0.10 is plenty
there (pass --strength 0.10). Note protect_text shields the text regions SynthID
hides in (use --no-protect-text for full removal on text-heavy images).

The same study found ctrlregen at clean-noise strength DESTROYS real images
(hallucinated micro-text in smooth regions), with no usable middle setting, so the
literature's 'clean-noise is the lever' did not hold empirically. Flag ctrlregen
EXPERIMENTAL in the CLI --pipeline help, README, and watermark_profiles; SDXL
img2img at ~0.3 stays the shippable path.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Victor Kuznetsov
2026-05-31 16:38:49 -07:00
co-authored by Claude Opus 4.8
parent 729f5f2ecd
commit cddbaf6413
6 changed files with 50 additions and 31 deletions
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tests/test_platform.py
+1 -1
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@@ -131,7 +131,7 @@ class TestResolveStrength:
assert resolve_strength(None, "default") == DEFAULT_STRENGTH
def test_none_ctrlregen_uses_clean_noise_default(self):
# ctrlregen must NOT inherit the light SDXL 0.10 (that makes it a no-op);
# ctrlregen must NOT inherit the SDXL DEFAULT_STRENGTH (that makes it a no-op);
# clean-noise regeneration is the lever against robust marks.
assert resolve_strength(None, "ctrlregen") == CTRLREGEN_DEFAULT_STRENGTH
assert CTRLREGEN_DEFAULT_STRENGTH > DEFAULT_STRENGTH