> I want to make the output image have the meaning of reflectence,how can I do it
> ?
> I input the reflectance.txt in scece, normally,I get the output is the same as
> input，that is reflectence. However I find the output is not what I
> input.I use the histogram to statistic the output and input,and I find the
> simulation image by pov ,which it's  profile  is shaking so intensive between
> 1000-4000 ? I have a confusion a long time ?Beg a hot person to help me .Why?
>
>

In POV_Ray, most texture values are in the 0..1 range. If you have 
something in the 1000..4000 range, it gets clipped to 1.
So, you need to scale the value you get for the maximum possible 
reflectance so that it returns something close to 1 but not larger than 
that.

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