Copyright © 2019 Apple Inc.

The files in this folder consist of SDR - BT.601 (NTSC SMPTE-C) patches of varying intensities. 

The theoretical (ideal) luminance values are:

10-bit Codeword   cd/m^2	
64                0.0005
108               0.0994
152               0.4581
196               1.1563
240               2.2519
284               3.7918
328               5.8167
372               8.3624
416               11.4615
460               15.1440
504               19.4376
544               23.8931
588               29.4243
632               35.6382
676               42.5569
720               50.2017
764               58.5929
808               67.7498
852               77.6913
896               88.4356
940               100.0000

The ideal CIE 1931 x,y values are the same for all luminance points.

x: 0.3127
y: 0.3290