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From: Nicolas Alvarez
Subject: Re: Same scene renders different in v3.7beta34 versus v3.62
Date: 8 Sep 2009 13:38:31
Message: <4aa69696@news.povray.org>
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Warp wrote:
> If I want a program to write the value 12345 to a file, then I expect
> the program to write 12345 to the file, not some other value. Why should
> the program try to guess what I "really want"?
>
> One reason can be that I want to match exactly the image pixel values
> with
> HTML colors. If I want the color scheme of an image to match, for example,
> the background color of a HTML page, I should be able to do that.
Wouldn't the browser do gamma correction according to the gAMA chunk anyway?
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From: Nicolas Alvarez
Subject: Re: Same scene renders different in v3.7beta34 versus v3.62
Date: 8 Sep 2009 13:53:01
Message: <4aa699fd@news.povray.org>
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clipka wrote:
> Nicolas Alvarez schrieb:
>> I have an LCD monitor, and the checkerboard looked *green*. Quite
>> strange.
>
> Do you use an analog or digital connection?
Analog, unfortunately. My graphics card has a DVI connector but my monitor
doesn't.
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From: clipka
Subject: Re: Same scene renders different in v3.7beta34 versus v3.62
Date: 8 Sep 2009 14:38:54
Message: <4aa6a4be$1@news.povray.org>
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Nicolas Alvarez schrieb:
>> One reason can be that I want to match exactly the image pixel values
>> with
>> HTML colors. If I want the color scheme of an image to match, for example,
>> the background color of a HTML page, I should be able to do that.
>
> Wouldn't the browser do gamma correction according to the gAMA chunk anyway?
Yes, but Warp's problem was that HTML "50% grey" (#7F7F7F) is /not/
POV.Ray 0.5 grey.
Browser gamma correction will make sure POV-Ray 0.5 grey is properly
converted to 50% /brightness/, but HTML "50% grey" is 50% /voltage/ (at
the VGA output of a typical PC), equaling 22% brightness.
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From: clipka
Subject: Re: Same scene renders different in v3.7beta34 versus v3.62
Date: 8 Sep 2009 14:50:15
Message: <4aa6a767$1@news.povray.org>
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Nicolas Alvarez schrieb:
>>> I have an LCD monitor, and the checkerboard looked *green*. Quite
>>> strange.
>> Do you use an analog or digital connection?
>
> Analog, unfortunately. My graphics card has a DVI connector but my monitor
> doesn't.
In that case your display quality may suffer from the A/D-D/A conversion
between your graphics card and display, as well as parasitic inductance
and/or capacitance of the analog connection; if that differs for the
color channels, or if the channels are not sampled synchronously, color
shift may occur at sharp dark-to-bright or bright-to-dark transitions.
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