> 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
>
>

Top box, maximum brightness, can't clearly see the individual boxes, 
just hint at them.

Bottom box, usual contrast and I can distinguish the boxes of the top row.

White level is correct, black level is to dark.


Alain

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