this is *NOT* about gamma calibration again (this topic has been 
targeted numerous times and the POV-Ray help section 2.3.4 has some 
excellent write up) this is about brightness and contrast calibration 
witch is AS IMPORTANT as gamma correction.

Attached is a simple POV-Ray script and the image produced by it.

First the brightness (i.e. shadow) adjustment:
The top box is a dark rectangle that consists of 3 rows. You should be 
able to *clearly* identify and separate the four rectangles in the 
bottom row. You should even be able to separate the bottom-left 
rectangle from the center row.
If not you should adjust the *brightness* setting (and only that) of 
your monitor until you do.

The contrast (i.e. highlight) adjustment:
The bottom box is a bright rectangle that also consists of 3 rows. Again 
you should be able to *clearly* identify and separate the four 
rectangles in the bottom row. And (again) you should even be able to 
separate the bottom-left rectangle from the center row.
If not you should adjust the *contrast* setting (and only that) of your 
monitor until you do.

If you do even see the four rectangles within the top row of both - the 
shadow and highlight box - your are either lucky with your equipment or 
a quite rich person who has spend a lot of money for your display ;)

If you are not able to adjust your display to *clearly* see the 4 shades 
in the bottom row within both boxes, well, you should at least be aware 
that you will have 'problems' in judging your own work and also the work 
made by others.

I hope this will help and the 3rd part of monitor calibration - besides 
the transfer function (i.e. gamma correction) highlight/shadow 
adjustment as targeted within this post - would be color calibration 
(and also the most difficult one). All three of them are equally important.

-Ive

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