The port pre-registered a test and ran it: against live-splash-publisher.png
a cropped render scores RMSE 558.1 (0.85%) and a scaled one 10118.8
(15.4%). Cropping is 18x better.
Confirmed here independently, from a different observable: the committed
captures are 1279x675, 1280x690 and 1252x754. VARYING heights. A fixed
presenter resample produces one size; crops of differently-sized windows
produce exactly that spread. And ui-render-tone-curve.md had already
recorded every capture aligning at dy=0 dx=0 with correlation 0.9466, which
a 0.9375 vertical scale cannot produce -- the evidence was in the corpus
before I wrote the claim.
So the captures are crops of a 1:1 surface, and every RMSE, glyph count and
surface mean against them is pixels to pixels with no filter to caveat. The
blanket "everything measured off a PNG carries the resample" is withdrawn.
Not refuted: the cvar reading. Canary does letterbox by default. What is
refuted is my inference that the corpus's capture path went through it.
Whether the presenter is bypassed, the window is 1:1, or the tool crops
before saving is open and unestablished.
The error is the one this session keeps paying for: I read a configuration
and inferred a consequence FOR THE DATA without testing it against the
data. The test costs one render and one RMSE and I had every capture needed
to run it.
Also downgrades my refutation of the corpus's oracle principle from
"survives with a qualifier" to "survives, and my qualifier was wrong",
kept rather than deleted because the failure is the instructive part.
Section 1 (gamma: VdGetCurrentDisplayGamma is kStub, the splash shader has
no pow/ramp/lookup) and the two-path distinction stand unchanged.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jc4pciRArGHfxGGhEbwp5t
2d77570dab