Watch this image in it's original size (1920 x 1080)- otherwise it is 
completely useless.

With a decent monitor you should see (from top to bottom):
12 "black" boxes.
A continuous gray-scale without vertical banding.
12 "white" boxes.
9 "gamma" boxes where the one labeled 2.2 should match the background.

With a not so decent monitor you are probably unable to distinguish the 
4 top-left black boxes and might also see some vertical banding lines 
within the continuous gray-scale. But if you still see 8 top right 
"black" boxes and the 12 white ones you are OK - you just didn't want to 
spend too much money on your viewing device.

In case you see less than 8 "black" boxes or less than 12 "white" boxes 
or get strong banding lines you should at least be aware that your 
monitor is unsuited for judging images and the images you produce with 
POV-Ray will look very different (most likely quite flat) when viewed by 
someone with a decent monitor.


Note that this just tells something about the basic contrast, brightness 
and gamma properties of the monitor - and nothing about it's ability to 
render colors properly.

-Ive

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