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Issue #188: D65 reads as a small positive tint (test from #336) 

Daylight sits above the Planckian locus, so with the DNG / Lightroom tint
sign D65 converts to about +10, as Lightroom's Daylight preset has it.
Taken from #336, which made the same sign fix as #258.

Co-Authored-By: DWAA1660 <80738438+DWAA1660@users.noreply.github.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01912WaK6Rmew3wxZuPyX7E8
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Claude 2026-10-08 17:26:01 +00:00
parent 2565f893c4
commit 7d2bb5e5ec
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8
crates/color/src/cct.rs
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@ -150,6 +150,14 @@ mod tests {
assert!(v1 > v0);
}
/// Daylight lies above the Planckian locus, so D65 reads as a small positive tint, as
/// Lightroom's Daylight preset (5500 K, +10) has it (#188).
#[test]
fn daylight_has_a_positive_tint() {
let (_, tint) = xy_to_temp_tint(crate::D65);
assert!((5.0..15.0).contains(&tint), "{tint}");
}
#[test]
fn wb_matrix_maps_src_white_to_white() {
let sp = crate::REC2020;