> Am 10.04.2014 20:58, schrieb Kenneth:
>> I'm beginning to think that there is something wrong with my
>> computer/monitor
>> set-up (Windows XP on a CRT monitor): The .png images that various
>> POV-Ray users
>> are uploading to the newsgroups look 'dark' on my system, and I have
>> no idea
>> what the cause is. (Well, I'm guessing that the images *should* look
>> brighter,
>> although I don't know for sure.)
>
> There are various possible reasons:
>
>
> (A) Personal preference.
>
> Some people simply love playing with darkness and light, and the images
> may be intended to be that dark, while you may prefer images to have
> less contrast.
>
>
> (B) Your "display gamma".
>
> In a nutshell, no two computer/display combinations natively show the
> same image in the same way, due to hardware tolerances, manufacturer
> preferences, and brightness/contrast control settings.
>
> The only way to make sure your computer display shows .png images
> exactly the way they are supposed to be (according to the file format
> specification and the data in the file) is to /calibrate/ your display,
> which in essence means that you teach your computer to auto-correct for
> your display's peculiarities.
>
> While proper calibration would require a colorimeter (and would also
> account for hue and saturation issues), if proper brightness is all you
> want then simple /gamma correction/ will suffice; most display hardware
> I know of comes with tools to perform gamma correction, and if I'm not
> mistaken Windows 7 and later (maybe also Vista) comes with such tools
> onboard.
>
>
> (C) The author's display gamma.
>
> Just as you can't be sure /you're/ seeing what's officially encoded in
> the .png file unless /your/ display is calibrated, you can't be sure
> that what's officially encoded in the .png is what the /author/ was
> seeing unless /their/ display is calibrated as well. However, in most
> cases this is obviously outside your area of influence.
>
>
> (D) Your display's "black level".
>
> Your display may be unable to show the same level of black that the
> original author saw, which might "drown" some almost-but-not-quite black
> details. However, while this is a common issue with LCDs, it is rarely
> seen in CRT displays.
>
>
> In real life it's typically a combination of (A)-(C), as well as (D) for
> people who have an LCD.
>
>

(E) Your display's "white" level.

Many CTRs tend to get blurry when the white level is set moderately 
high. This forces the user to greatly reduce the overall brightness, 
often to the minimum possible level, to prevent the bluring of text and 
the eye strain it will cause.

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