> I'm working on a small experiment with 3d color-space, and it seems to be
> working perfectly, it renders beautifully, but when it saves, the png files have
> a truncated color table.  It's quite distressing.
> 
> I've had no obvious trouble with other renders.
> 
> Also, my jpeg output seems to be broken, and the render results are completely
> different in windows 7.
> 
> I am using beta 34 under windows 7 and Fedora 11 on a Fujitsu Lifebook t5010.
> So far as I know I have all the proper libraries downloaded in Fedora, I just
> rebuilt the beta with libSDL.
> 
> My scene code is as follows:.
> 
> camera {
>     location <3.5, 5.0, -10.0>
>     up y
>     right x*(image_width/image_height)
>     look_at 0.0
>     }
> //light_source { <3.5, 5.0, -10.0> color rgb 1.0 }
> 
> #declare r = function(x,y,z,rho) { rho*cos(atan(y/x))*sin(acos(z/sqrt(x*x +
> y*y))) }
> #declare g = function(x,y,z,rho) { rho*sin(atan(y/x))*sin(acos(z/sqrt(x*x +
> y*y))) }
> #declare b = function(x,y,z,rho) { rho*cos(acos(z/sqrt(x*x + y*y))) }
> 
> object {
>     sphere { 0.0, 3.0 }
>         hollow on
>         pigment { rgbft 1 }
You should use "rgbt 1" or "rgbf 1".
>         finish {
>             ambient 1
Normaly, you use "ambient 0" in a case like this.
>             diffuse 0
>             }
>         interior {
>             media {
>                 intervals 1
Default value.
>                 scattering { 1, rgb 0.1 }
>                 samples 30, 50
Only the first value is used. ",50" is totaly ignored.
>                 emission rgb 0.6
>                 density {
>                     function { r(x,y,z,1) }
>                     color_map {
>                         [0.0 rgb 0]
>                         [1.0 rgb <1,0,0>]
>                         }
>                     }
>                 }
>             media {
>                 intervals 1
>                 scattering { 1, rgb 0.1 }
>                 samples 30, 50
>                 emission rgb 0.6
>                 density {
>                     function { g(x,y,z,1) }
>                     color_map {
>                         [0.0 rgb 0]
>                         [1.0 rgb <0,1,0>]
>                         }
>                     }
>                 }
>             media {
>                 intervals 1
>                 scattering { 1, rgb 0.1 }
>                 samples 30, 50
>                 emission rgb 0.6
>                 density {
>                     function { b(x,y,z,1) }
>                     color_map {
>                         [0.0 rgb 0]
>                         [1.0 rgb <0,0,1>]
>                         }
>                     }
>                 }
>             }
>     }
> 
> I ran the same scene under both Windows and Linux using the same settings each
> time +a0.3 +FN24 +W800 +H600
You want 24 bits per CHANEL? 72 per pixel...
+fn set output to PNG at 8 bits per chanel, for 24 bits per pixel.
> 
> Fedora renders the image beautifully, properly blending the three channels, but
> the save file only retains a fraction of the color-depth.
> 
> Windows saves exactly what it renders, but most of the color is just gone. The
> center of the color-space turns solid black, and the most vivid waves of color
> that show in the Fedora render are gone as well, leaving only some smudges in
> the primary and secondary zones
> 
> A.D.B.
> 
> 
> 

Alain

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