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"Ive"  schreef in bericht news:4cf6fed2$1@news.povray.org...

On 02.12.2010 01:01, Jaap Frank wrote:
> ....

Trust me, Warp is correct and if you see it different there is something
screwed up with your display system. One cannot *perfectly* calibrate a
display without usage of some external hardware but for, let's say
hobbyist usage, there are quite a lot tools (and web-pages) around that
allow for visual adjustment but all of them boil down to something
similar Warp has shown.
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Thanks for the fast reaction. Please read my reaction on the comment of 
Warp too.

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> I'm wondering if the default 3.7 approach is correcting the values for a
> 2.2 gamma display in the file, while the display system thinks it gets
.....

A.1. but the actual value can be adjusted by the display_gamma setting
with the recommended default of 2.2 (unless you know what you are doing ;)
B.1. but the actual value can be adjusted by the file_gamma setting with
the recommended default of 2.2 (unless you know what you are doing ;-P)
and the exception of high dynamic range formats being always encoded
linear (as they should be by definition).

C.2. is true for POV-Ray 3.7 AND 3.6 and PNG input format except when no
gamma chunk was present when POV-Ray 3.6 did apply no correction at all
(see below).

C.1. is true for POV-Ray 3.7 and any other format than PNG
BUT POV-Ray 3.6 did use the gamma encoded values internally directly
without converting them to linear color space and this was plain wrong!
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Then I did understand it right. Now I'm sure about it, thank you.

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-Ive (and sorry for sending the mail - this happens to me all the time,
I really should learn how to use Thunderbird)
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Don't bother about that personal email, it has happened to me too.

Jaap Frank

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