[Radiance-general] Tone mapping for animation

[Jack de Valpine]

Hi David,

I am a little unclear on what you want to accomplish but here are a few 
thoughts.

 1. time series animation with constant exposure on successive frames -
    use pfilt -1 -e [constant exposure setting] for each frame
 2. time series animation with tone mapping function on successive
    frames - use pcond and phisto, phisto will compute a histogram
    across a series of frames pcond can then use the results from phisto
    to tone map the frames according to selected tone mapping operator,
    there is a an example in the man page for pcond

I think that maybe where I am confused by your description is that since 
Radiance output is already HDR, setting exposure is really a post 
process. I think that what you are looking for is the second option that 
I describe above.

Not sure if this answers your questions, but perhaps gives you some 
things to look into.

Best,

-Jack

-- 
Jack de Valpine
President

Visarc Incorporated
www.visarc.com

channeling technology for superior design and construction

On 10/22/2013 9:45 AM, David Geisler-Moroder wrote:
> Hi all,
>
> I have a question concerning the tone mapping procedures implemented 
> in the Radiance tools.
> For an animation of a full day I would like to get something similar 
> that a camera would do that just takes a picture every 5 minutes with 
> the same settings (exposure time and aperture). Rendering the images 
> for every 5 minutes is not a problem, however, I stuck when trying to 
> convert the HDRs to some tonemapped images. As far as I got it, In 
> ra_jpeg/hdr2jpeg no exposure can be given at all, in ra_tiff/ra_bmp 
> only relative exposures can be applied.
>
> Thus my question: is it possible to explicitly set the exposure used 
> in the tonemapping process with any tool in Radiance?
>
> Thanks in advance!
> David
>
>
>
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