The recording sampled a red brick wall and moved the sliders by three units, which at GIF size is a click that does nothing. The scene now drags the frame cold first and picks a white air conditioner, so the correction is visible and the picker's being absolute - set from the photograph, not from where the sliders were - is what the picture shows. The text says so, and says a blown highlight is refused.
tools/manual — the pictures in docs/manual
record.sh <library> drives the desktop build on a private X server and
records every scene in scenes.py into docs/manual/media/. drive.py is
the puppeteer underneath — launch, click, drag, type, screenshot, record —
and is usable on its own to look at a panel after changing it:
DR_HOME=/var/tmp/x tools/manual/drive.py launch /some/folder
tools/manual/drive.py click 1543 22 # Settings
tools/manual/drive.py shot /tmp/settings.png
tools/manual/drive.py stop
The demo library is the author's: seventy frames with no people in them,
the fixtures/pano set among them. The scenes' cell coordinates are for
that grid, at 1600×1100; the panel coordinates hold for any library.
Two things the scripts know that are not obvious: a Slint TouchArea wants
a held press, not xdotool's click; and the app is driven on Xvfb rather
than the desktop because under XWayland at scale 2 a pointer warp lands at
twice the coordinate asked for.