Warp <war### [at] tagpovrayorg> wrote:
> I would like to know your opinion on these as well:
>
> 1) Which one of these images do you think looks more realistic?
>
> http://koti.kapsi.fi/warp/media/pov37_test1.png
> http://koti.kapsi.fi/warp/media/pov37_test2.png
>
>
> 2) Currently, when using assumed_gamma 1 in povray 3.7 mode, default
> color values in things like the ambient finish do not get adjusted in
> terms of srgb, but remain in their rgb values (for example, the default
> ambient finish is "rgb 0.1"), which means that a change in assumed_gamma
> will affect their brightness.
>
> The second image above was rendered by explicitly specifying the default
> ambient finish (using the #default directive in the scene file) using
> "srgb". Without this explicit setting, ie. using the default value, the
> image looks like this:
>
> http://koti.kapsi.fi/warp/media/pov37_test4.png
>
> (It's essentially impossible to get any shades are darker than that due to
> the default ambient finish.)
>
> So my question is: Should POV-Ray define default colors (eg. in the ambient
> finish, and anywhere else where there are default colors) in terms of srgb
> (which would result in the second image by default, without having to
> explicitly set those defaults), or is the current functionality ok (which
> by default results in the third image).
>
> --
>                                                           - Warp

I'm going to take the initiative to move this into a separate message thread due
to Clipka asking not to reply to posts in the "survey" thread.

I must ask, was the scene absolutely identical other than srgb replacing rgb?

That reflection on the red and white ball changes drastically from first image.
Guessing radiosity was not used...?

Something that comes to mind about the ambient change is what about emission
srgb instead of rgb? Wouldn't that be needed as well?

Thanks for showing these differences because I think it shows the trouble I had
with understanding how assumed_gamma 1 and srgb versus rgb was affecting the
renderings. Usually cranked up the assumed_gamma above 1.0 to improve
appearance, probably a bad way to go about it. And then I was using
assumed_gamma srgb and still not certain what was the best way before adjusting
scene texture elements once again.

Bob

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