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.

Bill P.

(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. :-)

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