> My goal is getting luminance of final pixels.I have set the output openexr.I
> have converted the irradiance to illumiance as the lightsource input,my code is
> as below:
>
> #version 3.7;
> global_settings{ assumed_gamma 1.0 }
> #include "spectral.inc"
> #declare SpectralWavelength =700;
>
> camera
> {
> angle  7.54371
> location <camera_x,camera_y,camera_z >
> look_at <0,0,0>
> rotate <0,-31,0>
> right x
> up y
> }
>
> light_source {<sun_x,sun_y,sun_z>
>               SpectralEmission(3.99750132) //convert irradince to illuminance as
> input
>               }
>
> sphere
>      {
>        <x1-center_x,y1-center_y,z1-center_z>,
>        1.55
>         finish {
>                   ambient 0
>                   emission 0
>                   specular ref
>                 }
>        }
> I have read the openexr resorce code .It says the y channel represents luminance
> ,how can I set in pov ?Beg a hot!
>
>

What does the X and Z channels represent? Hue and saturation?
If that's the case, it's a hue, luminance, saturation (HLS) colour 
space. The conversion from RGB should be done automaticaly. Thus, you 
have nothing special to do.


Alain

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