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Video clipped to luminance range 16-235

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This QuickTime video-only file consists of a single frame divided into 255 rectangles (17 across by 15 down), each containing a different 8-bit luminance level (0 to 254 inclusive):
http://www.rtr.myzen.co.uk/steps255.mov
When imported by almost any program that can read QuickTime files, the luminance values which should be <16 end up at 16, and those that should be >235 end up at 235. My question is: how can I stop this happening? For example can I add an atom to the file or change a setting?
The file is uncompressed YUV ('2vuy') so if you are in any doubt as to the true luminance levels you can examine it using a hex editor.

Answers

This QuickTime video-only file consists of a single frame divided into 255 rectangles (17 across by 15 down), each containing a different 8-bit luminance level (0 to 254 inclusive):
http://www.rtr.myzen.co.uk/steps255.mov
When imported by almost any program that can read QuickTime files, the luminance values which should be <16 end up at 16, and those that should be >235 end up at 235. My question is: how can I stop this happening? For example can I add an atom to the file or change a setting?
The file is uncompressed YUV ('2vuy') so if you are in any doubt as to the true luminance levels you can examine it using a hex editor.

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