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Sylpheed/docs/re/captures/transitions/transition-luminance.csv
Sylpheed RE agent 7fef19b3a0 re: the transition between screens is a fade through black, and most of 
its timing is on the disc

Q7. Every title-side screen carries a full-screen black .prm quad that
paints last, and its keyframe group IS the transition: black at T0, clear
by T1, clear until T2, then back to black on exit. Read with the corpus's
start-of-a-ramp rule and Q1's time unit that gives 0.87s for EXTRAS,
0.97s for the main menu, 4.08s for the title -- from the file, not from a
stopwatch.

The disc-wide check is per-pak all-or-nothing rather than the 41% the
headline count suggests, and GP_TITLE's 6 of 12 is the useful row: the
six builds carrying a fade quad are exactly the six SCREENS, and the six
without are exactly the six overlays. GP_DIALOG is 0 of 133. That is
independent corroboration of the overlay finding from two iterations ago.

One piece is NOT on the disc and says so: the fade-OUT length. The fourth
keyframe has no time slot, because a group's last block stops four bytes
short. Measured instead, at 30fps, ~0.4s and the same both directions.

And a warning I earned: the luminance rise after a transition is NOT the
quad's ramp. The incoming screen's own elements animate in after the quad
has cleared -- 1.47s observed against a declared 0.97s. Time the fade
from where the frame is pure black.

Rig: screenshot samples at 0.5 Hz and cannot see a 0.4s fade at all,
which is why an earlier burst called this an instant cut. ffmpeg x11grab
at 30fps instead; both go in METHOD.
2026-08-28 18:05:19 +00:00

422 lines
7.4 KiB
CSV
Raw Blame History

frame,seconds,mean_luminance
0,0.0000,26.045
1,0.0333,26.054
2,0.0667,26.051
3,0.1000,26.054
4,0.1333,26.049
5,0.1667,26.054
6,0.2000,26.052
7,0.2333,26.053
8,0.2667,26.046
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10,0.3333,26.049
11,0.3667,26.052
12,0.4000,26.047
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60,2.0000,26.057
61,2.0333,26.062
62,2.0667,26.022
63,2.1000,22.032
64,2.1333,21.744
65,2.1667,17.909
66,2.2000,13.996
67,2.2333,13.966
68,2.2667,11.113
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72,2.4000,3.375
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86,2.8667,7.432
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97,3.2333,18.497
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104,3.4667,27.239
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129,4.3000,27.297
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150,5.0000,27.319
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155,5.1667,27.328
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157,5.2333,27.333
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160,5.3333,27.334
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248,8.2667,27.649
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251,8.3667,26.704
252,8.4000,23.887
253,8.4333,23.723
254,8.4667,16.471
255,8.5000,13.119
256,8.5333,13.102
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260,8.6667,5.365
261,8.7000,3.422
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272,9.0667,7.339
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275,9.1667,10.418
276,9.2000,10.462
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286,9.5333,19.438
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290,9.6667,19.508
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296,9.8667,23.467
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415,13.8333,26.165
416,13.8667,26.165
417,13.9000,26.168
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419,13.9667,26.165
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