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Does anyone know how to do HDR compositing in POV-Ray, or something
giving similar results? I do not mean a hdr output, but something more
sophisticated than simple averaging of images.
Thomas
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On 25.05.2014 14:00, Thomas de Groot wrote:
> Does anyone know how to do HDR compositing in POV-Ray, or something
> giving similar results? I do not mean a hdr output, but something more
> sophisticated than simple averaging of images.
A bit late reply but I think you can do the following:
- Treat the different exposures as functions (split into R + G + B)
- Combine these into new functions using "select": use value
from longer exposure by default, pull values from shorter exposure
where longer exposure is above some threshold (e.g. 0.9). When using
value of shorter exposure divide by appropriate factor (depending
on difference in stops)
- Render combined function pigment with HDR output
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On 1-7-2014 22:37, Christian Froeschlin wrote:
> On 25.05.2014 14:00, Thomas de Groot wrote:
>
>> Does anyone know how to do HDR compositing in POV-Ray, or something
>> giving similar results? I do not mean a hdr output, but something more
>> sophisticated than simple averaging of images.
>
> A bit late reply but I think you can do the following:
>
> - Treat the different exposures as functions (split into R + G + B)
> - Combine these into new functions using "select": use value
> from longer exposure by default, pull values from shorter exposure
> where longer exposure is above some threshold (e.g. 0.9). When using
> value of shorter exposure divide by appropriate factor (depending
> on difference in stops)
> - Render combined function pigment with HDR output
>
>
Thanks Christian. In fact Clipka suggested what I should have known:
render in exr and post-process in Ive's IC.
Thomas
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On 02.07.2014 9:08, Thomas de Groot wrote:
> Thanks Christian. In fact Clipka suggested what I should have known:
> render in exr and post-process in Ive's IC.
ah then I misunderstood your question. I thought you wanted
to composite actual photos (taken with different exposure lengths)
as HDR in POV-Ray :)
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On 14-7-2014 2:53, Christian Froeschlin wrote:
> On 02.07.2014 9:08, Thomas de Groot wrote:
>
>> Thanks Christian. In fact Clipka suggested what I should have known:
>> render in exr and post-process in Ive's IC.
>
> ah then I misunderstood your question. I thought you wanted
> to composite actual photos (taken with different exposure lengths)
> as HDR in POV-Ray :)
>
>
Somehow I wanted to use POV-Ray images as equivalents of actual photos.
It certainly works but the final hdr quality using the Fusion F1 program
for instance is less than making an exr image in the first place.
However, it was an interesting experiment which I may use in other
occasions.
Thomas
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