On Thu, 10 Apr 2014 23:53:16 EDT, "Kenneth" <kdw### [at] gmailcom>
wrote:

Have a look at this web page or search for "grey scale step wedge"

http://www.pbase.com/jackcnd/1080p_tests

in particular look at the greyscale step images.  On  a properly
calibratedhigh quality monitor you should be able to see and
differenciate all the steps.

I hope this helps

John

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