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-rw-r--r--src/colour_matrix.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/colour_matrix.h b/src/colour_matrix.h
index 615e8b38..a42c8dff 100644
--- a/src/colour_matrix.h
+++ b/src/colour_matrix.h
@@ -23,6 +23,7 @@ namespace colour_matrix {
extern double const xyz_to_rgb[3][3];
extern double const srgb_to_xyz[3][3];
+extern double const rec601_to_xyz[3][3];
extern double const rec709_to_xyz[3][3];
}