+ asset_B->set_key (kdm_B.keys().front().key());
+
+ shared_ptr<dcp::OpenJPEGImage> xyz_A = asset_A->get_frame(0)->xyz_image ();
+ shared_ptr<dcp::OpenJPEGImage> xyz_B = asset_B->get_frame(0)->xyz_image ();
+
+ scoped_array<uint8_t> frame_A (new uint8_t[xyz_A->size().width * xyz_A->size().height * 4]);
+ dcp::xyz_to_rgba (xyz_A, dcp::ColourConversion::srgb_to_xyz(), frame_A.get());
+
+ scoped_array<uint8_t> frame_B (new uint8_t[xyz_B->size().width * xyz_B->size().height * 4]);
+ dcp::xyz_to_rgba (xyz_B, dcp::ColourConversion::srgb_to_xyz(), frame_B.get());