pub fn srgb_decode_lut() -> &'static [f32; 256]Expand description
The 256-entry sRGB→linear decode table, built once — the workspace’s one
sRGB decode. A table rather than a powf per channel because
frames_to_settle runs a full-frame difference per captured frame, and the
probe is a whole sequence of them.
Index it by the stored byte: lut[b] is the linear light of code value b.
linear_diff’s doc comment carries why a level comparison decodes first
(private, hence named rather than linked).