sylpheed-port ran the signed-edge discriminator I proposed but could not execute --
it needs their render beside the capture. Recorded as their measurement, with their
tool and commit.
Controls against deliberately damaged copies of their own render: a known +1 px
shift reads back as +0.938 px, a known blur as r -0.896 on the laplacian, neither
leaking into the other's channel. The menu against the capture gives -0.010 px
horizontal, -0.009 px vertical, laplacian r +0.103 -- and the weak blur term is the
opposite sign to the blur control.
So global misregistration and blur are both excluded, and of the three candidates I
named the misplaced soft element is the only one left.
Reach is the whole reach: a whole-frame fit excludes a global translation, not a
local one, since one misplaced element is a small share of 38752 edge pixels. The
next test is local and needs the residual map, which is theirs.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
sylpheed-port found that my control's premise misreads their figure. The 0.06 %
counts pixels surviving -threshold 25%, differing by more than ~64 levels -- a
gross-displacement detector, blind to sub-pixel offsets and antialiasing, which are
exactly what a per-level LUT also cannot close. It says no gross displacement, not
geometry is right, and I read one as the other.
Their direct measurement, attributed and not reproduced here: after the LUT the
menu's residual is 6.94 on edge pixels against 2.20 on flat, with a known negative
leaving 0.00. So the menu carries spatial error and is not a geometry-free control.
The 32/68 result does not rest on it -- 'whatever a fitted per-level LUT cannot
close is not a per-level effect' is the method's own basis and is self-standing.
What the control shows is narrower than claimed.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
Records the settle-time decode, and corrects two claims it overturns.
docs/re/structures/ui-settle-time.md is the finding: a settled screen is one
instant every element is posed at, the disc names it (the midpoint of the
longest keyframe-free interval), and the title's arc closes from 33.22 to
11.79 with the clipped-pixel count landing on the console's 1459 within 0.5%.
Includes the disc-wide reach -- only 30% of bundles have a window wide enough
to trust -- and a three-way figure.
Withdrawn in ui-rotation-implemented.md:
* "Flat. No minimum." was not a property of rotation. `at` posed LEAVES ONLY,
so the scan moved the light sweeps and never touched the top-level flashes.
* "our renderer does not draw ptlogo1/ptlogo2 at all" is wrong. Both are
drawn; the four elements the diagnostic named are kind-0x4 ghosts sharing
their template's name. Hiding the real ones makes the error WORSE by
+5.20 and +7.47.
* Its 10.92 baseline is not reproducible -- 14.07 at its own pre-change tag
and 14.07 today -- so the "1.7% better" verdict rests on an unrecorded
recipe. Flagged in title-residual-tone-vs-geometry.md too.
METHOD.md gains two traps: a shared CARGO_TARGET_DIR makes a `git worktree`
build silently replace the binary you run next (it cost three renders here,
caught only because a missing flag was a hard error rather than a wrong
number); and an aggregate computed per-element is not a state of the system.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QsEPXWVaEpyfudtR6re1Pd
Separates two confounded effects so the pending rotation decision has a number:
how much would drawing the rotation actually buy.
A per-level lookup table fitted on a screen is the most general tone model there
is -- every render level mapped to whatever capture level minimises the error,
no functional form assumed -- so whatever such a LUT cannot close is by
construction not a per-level effect. Fitting on the screen itself therefore gives
an upper bound on the tone share and a lower bound on the geometry share.
Positive control: on the main menu, where the port measures 0.06 percent of
pixels differing so geometry is essentially right, a self-fitted LUT closes
70.3 percent, from 9.26 to 2.75. The instrument can collapse a tone-dominated
residual.
Result: on the title the same self-fitted LUT closes only 32.0 percent, from
10.92 to 7.42. So at most a third of the title s disagreement is tone and at
least two thirds is spatial -- content in the wrong place, which is where the
rotation lives. The fitted LUT is generous to tone, so the geometry share is if
anything larger.
Also refutes the idea of a single transferable tone curve. Fitted on the title
and applied to the menu it closes 29.7 percent; fitted on the menu and applied to
the title it makes things 24 percent WORSE. A curve fitted on a dark flat screen
is unconstrained at the bright end -- the menu s populated range is levels 5 to
204 with few bright pixels -- and extrapolating it onto the title s planet and
wordmark actively harms. That extends the existing refutation of the single
exponent: even a full per-level LUT fails to transfer, so a consumer must not
carry a global tone correction.
Reach: two screens, one capture each, and the title pairing is the same screen
but not the same instant, so the ratio is what is claimed rather than the
absolute level. Our render draws the sweeps parent record only, so the geometry
share includes both the missing rotation and the missing leaf placement -- both
closed by the same decision.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QsEPXWVaEpyfudtR6re1Pd
