Every bake of a Vision3 stock logged:
unknown illuminant "K75P", falling back to D55
K75P is a cinema xenon short-arc lamp, and Kodak 2383 and 2393 -- the
projection print films those stocks print onto -- name it as the light their
result is looked at under. It was never implemented, so it fell through to
the unknown branch.
The fallback was the right family: a xenon arc sits near 6000 K, close to
daylight and nothing like the tungsten enlarger above it. So the pixels do not
move. What changes is that D55 is now a documented choice rather than the
consolation prize for an unrecognised string, with the approximation stated --
an arc has line structure a Planckian curve cannot express, and the residue of
that is small here because the viewing step adapts the white point out either
way.
The test is the point of the commit. A profile naming a light nobody
implemented should fail the suite, not whisper into a log that only gets read
when somebody happens to be looking for something else -- which is how this
was found.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
dtourolleandClaude Opus 5
f14176de29