Alain wrote:
> minzi0815 nous illumina en ce 2008-05-28 02:12 -->
> 
>> Warp <war### [at] tagpovrayorg> wrote:
>>
>>> minzi0815 <mar### [at] eumetsatint> wrote:
>>>
>>>> So than means, the 65535 possible values are scaled to 256 colors ?
>>>
>>>   No, it means that you can only specify up to 256 entries in a color 
>>> map.
>>> Colors are interpolated between these entries and thus the total 
>>> amount of
>>> colors generated is limitless (well, limited by floating point range).
>>>
>>> -- 
>>>                                                           - Warp
>>
>>
>> Well, to be honest, I am getting a little cobfused.
>> The question for me is the following:
>>
>> I want to display a df3 - file that holds 16 Bit measuring values that 
>> range
>> from 0 to 65535. I want povray to display each value in a different 
>> color. How
>> is that possible to do ? Do I need a color map at all ?
>>
>>
> The simplest color_map possible (color_map[0 rgb 1][1 rgb 0]) actualy 
> have an "infinite" number of distinct values. That is, every real values 
> comprised between 0 and 1. This number is reduced in a computer by the 
> limitation of the binary floating point encoding, but still largely 
> bigger than 65535.
> 
But that would give gray values only.  Going linearly from rgb <1, 1, 1> 
to rgb <0, 0, 0> would change the red/green/blue values together 
resulting in gray values throughout.  Infinite gradations 
(theoretically), but still only shades of gray.  To get all possible 
*colors* it would be necessary to change the red/green/blue values 
independently, and that's not a linear change.

      -=- Larry -=-

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