Op 17/02/2021 om 17:04 schreef William F Pokorny:
> On 2/14/21 9:48 AM, William F Pokorny wrote:
>> On 2/13/21 6:39 AM, William F Pokorny wrote:
>>> On 2/11/21 2:12 PM, Kenneth wrote:
>> ...
>>>
>>> When I write to exr or hdr I was expecting linear encoded values, but 
>>> this is not what I see...
>>>
> ..
>>>
>>> I believe exr and hdr input and output are supposed to be linear. 
>>
>> Comments in the code say this is the intent. It is not what is 
>> happening on write...
>>
> 
> Got back to looking at this - and I got EXACTLY what I asked for in my 
> coding in the scene file! All is good with POV-Ray.
> 
> I thought I was using linear encoding for the emission colors, but I was 
> actually using srgb... (a)
> 
> My personal discoveries related to the exr(as used) and hdr formats not 
> being useful for other than expressing dynamic range, stand. In other 
> words, don't use these two formats for height fields and such.
> 

Yes, that is what I had always thought indeed.

> 
> (a) Growing up my family owned a small, single crew, tree service and 
> one of my brothers has a small tree service of his own. A decade or more 
> ago he suggested I read the book, "The Wild Trees." In it there's a 
> story about an experienced climber taking a fall - while still thinking 
> to yell "headache!" to those on the ground. His reason for falling came 
> to being in that place where you trust your own skill too much. Twice in 
> the last month that's been me with simple, quick scene files. My 
> apologies for the false alarms. Please imagine, "HEADACHE!!!" in the 
> subject line for my next post (or two) about there being a problem with 
> POV-Ray. :-)
> 

Noted.



-- 
Thomas

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