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Hi Folks,
I've used POV-Ray for a while - but - I'm still very much a beginner... I'm
more of a modeler... I stumbled upon some settings I like and I just repeat them
over and over again while changing the camera location... I recently upgraded my
POV-Ray from 3.6 to 3.7... When I do my renders of 3DCanvas/Crafter models - the
colors now seem all washed out... I'm even running old vesrions of POV-Ray files
that I saved under 3.6 - and the - colors are totally different between the two
render engines... Is there any trick to make the colors more vivid as they
appeared in 3.6 ??? Any help - greatly appreciated...
Regards,
Scott
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scottb613 <nomail@nomail> wrote:
> I've used POV-Ray for a while - but - I'm still very much a beginner... I'm
> more of a modeler... I stumbled upon some settings I like and I just repeat them
> over and over again while changing the camera location... I recently upgraded my
> POV-Ray from 3.6 to 3.7... When I do my renders of 3DCanvas/Crafter models - the
> colors now seem all washed out... I'm even running old vesrions of POV-Ray files
> that I saved under 3.6 - and the - colors are totally different between the two
> render engines... Is there any trick to make the colors more vivid as they
> appeared in 3.6 ??? Any help - greatly appreciated...
Which version of 3.7? Unless you specifically add a "#version 3.7;" to
your file it shouldn't change the colors compared to 3.6.
--
- Warp
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"Warp" <war### [at] tag povrayorg> schreef in bericht
news:4dc2d1c2@news.povray.org...
> Which version of 3.7? Unless you specifically add a "#version 3.7;" to
> your file it shouldn't change the colors compared to 3.6.
It sounds like a gamma issue. The documentation will help you.
Thomas
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Am 05.05.2011 14:54, schrieb scottb613:
> Hi Folks,
>
> I've used POV-Ray for a while - but - I'm still very much a beginner... I'm
> more of a modeler... I stumbled upon some settings I like and I just repeat them
> over and over again while changing the camera location... I recently upgraded my
> POV-Ray from 3.6 to 3.7... When I do my renders of 3DCanvas/Crafter models - the
> colors now seem all washed out... I'm even running old vesrions of POV-Ray files
> that I saved under 3.6 - and the - colors are totally different between the two
> render engines... Is there any trick to make the colors more vivid as they
> appeared in 3.6 ??? Any help - greatly appreciated...
Your old scenes probably have neither a "#version" nor an
"assumed_gamma" statement. In that case, adding
#version 3.6;
and/or
global_settings { assumed_gamma 2.2 }
as the very first statements in your scene file should be the easiest
way do the job.
If you're still experiencing problems and happen to be rendering to PNG
file output, try any other output file format (e.g. BMP or TGA).
For background information, see the documentation section about Gamma
handling already mentioned by Thomas.
In a nutshell, the problem is that up to version 3.5 (and by default
also in 3.6), POV-Ray used a poorly defined (and inconsistent) color
model, leading to images that you'd have to call either physically
inaccurate or overly vivid (depending on how you'd interpret that color
model); accordingly, scene authors' way of dealing with this situation
would have to be interpreted as either accepting the physical
inaccuracy, or using washed-out colors to compensate for the effect.
POV-Ray 3.7's default color model is much more well-defined, and most
importantly self-consistent; as it is based on the latter
interpretation, but without giving /overly/ vivid results, old scenes
will appear to /lack/ vividness.
The workaround of using "#version 3.6;" informs POV-Ray what version the
scene is designed to render weill with, causing POV-Ray 3.7 to use the
same color model default as 3.6. Using "assumed_gamma 2.2" explicitly
tells POV-Ray to use the old color model. Only one of these two
statements should be necessary, but it won't hurt to use both.
Note that for new scenes it is recommended to instead use
#version 3.7;
global_settings { assumed_gamma 1.0 }
(causing POV-Ray to use the new, physically accurate and consistent
color model), and simply use more vivid material colors instead, as this
will allow for more realistic results.
Most color pickers will tell you that the less vivid material colors
should be right; this is because they actually use a different color
model. To use such color values, instead of (e.g.)
color rgb <0.6, 0.5, 0.3>
you'll have to use
color srgb <0.6, 0.5, 0.3>
which is roughly equivalent to
color rgb <0.33, 0.22, 0.07>
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Thomas de Groot <tDOTdegroot@interdotnlanotherdotnet> wrote:
> "Warp" <war### [at] tagpovrayorg> schreef in bericht
> news:4dc2d1c2@news.povray.org...
> > Which version of 3.7? Unless you specifically add a "#version 3.7;" to
> > your file it shouldn't change the colors compared to 3.6.
> It sounds like a gamma issue. The documentation will help you.
It should not be an issue with the latest release candidate, unless
he explicitly wrote a "#version 3.7" a the beginning of the scene file.
Either he is using an older beta, or there's something else going on.
--
- Warp
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clipka <ano### [at] anonymousorg> wrote:
> Your old scenes probably have neither a "#version" nor an
> "assumed_gamma" statement. In that case, adding
> #version 3.6;
> and/or
> global_settings { assumed_gamma 2.2 }
I thought that was now the *default* when #version is not specified.
Has that been changed back?
--
- Warp
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"Warp" <war### [at] tagpovrayorg> schreef in bericht
news:4dc8156f@news.povray.org...
> It should not be an issue with the latest release candidate, unless
> he explicitly wrote a "#version 3.7" a the beginning of the scene file.
>
> Either he is using an older beta, or there's something else going on.
Even with #version 3.7 and assumed_gamma 1.0 statements, it might still be
an issue if his screen is badly gamma calibrated I believe.
Thomas
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Am 10.05.2011 09:08, schrieb Thomas de Groot:
> "Warp"<war### [at] tagpovrayorg> schreef in bericht
> news:4dc8156f@news.povray.org...
>> It should not be an issue with the latest release candidate, unless
>> he explicitly wrote a "#version 3.7" a the beginning of the scene file.
>>
>> Either he is using an older beta, or there's something else going on.
>
> Even with #version 3.7 and assumed_gamma 1.0 statements, it might still be
> an issue if his screen is badly gamma calibrated I believe.
Just to clarify a few things:
- POV-Ray 3.7 RC3 defaults to #version 3.7 and assumed_gamma 1.0, so it
makes no difference whether you explicitly specify those or not. On the
other hand it /does/ make a difference whether you specify #version 3.6
or not: POV-Ray 3.7 does /not/ default to 3.6 compatibility.
- To get the same result as with 3.6 defaults, specifying #version 3.6
and/or assumed_gamma 2.2 is the way to go.
- Any influence of display calibration can be ruled out here, as it
would have the same effect in 3.7 as it did in 3.6.
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"clipka" <ano### [at] anonymousorg> schreef in bericht
news:4dc92121$1@news.povray.org...
>
> Just to clarify a few things:
>
> - POV-Ray 3.7 RC3 defaults to #version 3.7 and assumed_gamma 1.0, so it
> makes no difference whether you explicitly specify those or not. On the
> other hand it /does/ make a difference whether you specify #version 3.6 or
> not: POV-Ray 3.7 does /not/ default to 3.6 compatibility.
>
> - To get the same result as with 3.6 defaults, specifying #version 3.6
> and/or assumed_gamma 2.2 is the way to go.
>
> - Any influence of display calibration can be ruled out here, as it would
> have the same effect in 3.7 as it did in 3.6.
Well, that did clarify things for me at least :-)
My thick skull is slow to penetrate. I understand things better now.
Thomas
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clipka <ano### [at] anonymousorg> wrote:
> - POV-Ray 3.7 RC3 defaults to #version 3.7 and assumed_gamma 1.0, so it
> makes no difference whether you explicitly specify those or not.
Actually RC3 defaults to assumed_gamma 2.2 if #version is not specified,
for backwards compatibility with 3.6 (in other words, if #version is not
explicitly specified, the scene is assumed to use pov3.6 default assumed
gamma, which would be 2.2). By design. This was explicitly stated.
You can test it. (I just did, to make sure I'm not speaking BS.)
Hence I'm surprised that the OP is seeing washed out colors. Either he
is using an older beta, or he specified #version 3.7 in his scene.
--
- Warp
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