Problem: with no working space and Working Gamma 2.4, a linear EXR still
converted with the sRGB curve (0.18 -> 0.4627, After Effects 0.4902):
float footage was sRGB-encoded at decode, before the render knew the
project's curve. Interpret As Linear Light on float footage then encoded
a second time (0.18 -> 0.7255).
Fix: FootageSource::frame_with asks for float footage with a FloatCurve
(sRGB, a pure 2.4 power curve, or as stored). The renderer asks for the
Working Gamma's curve when unmanaged, sRGB when managed, and the stored
values when Interpret As Linear Light encodes them afterwards.
MediaPool decodes float values that way (Preserve RGB still reads them
as stored) and caches each curve apart.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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