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-rw-r--r--src/rgb_xyz.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/rgb_xyz.cc b/src/rgb_xyz.cc
index 071c800a..98520a2c 100644
--- a/src/rgb_xyz.cc
+++ b/src/rgb_xyz.cc
@@ -100,7 +100,7 @@ libdcp::xyz_to_rgb (shared_ptr<const XYZFrame> xyz_frame, shared_ptr<const LUT>
}
shared_ptr<libdcp::XYZFrame>
-libdcp::rgb_to_xyz (shared_ptr<const Image> rgb, shared_ptr<const LUT> lut_in, shared_ptr<const LUT> lut_out, float const colour_matrix[3][3])
+libdcp::rgb_to_xyz (shared_ptr<const Image> rgb, shared_ptr<const LUT> lut_in, shared_ptr<const LUT> lut_out, double const colour_matrix[3][3])
{
assert (lut_in->bit_depth() == 12);
assert (lut_out->bit_depth() == 16);