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-rw-r--r--src/util/colour.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/util/colour.h b/src/util/colour.h
index 84c543c..ae50d32 100644
--- a/src/util/colour.h
+++ b/src/util/colour.h
@@ -4,6 +4,9 @@
#define D65_XYY_X 0.312726871026564878786047074755
#define D65_XYY_Y 0.329023206641284038376227272238
+#define D65_XYZ_X (D65_XYY_X / D65_XYY_Y)
+#define D65_XYZ_Z (1 / D65_XYY_Y - 1 - D65_XYZ_X)
+
static inline double
srgb_encode(double t)
{