Hi Jack, hi Lars, thanks a lot for the quick response! Jack, your second hint exactly did what I was looking for. I tried to use pcond first, but didn't think of the possibility to use a histogram...
Sorry, if my description was somehow cryptic, but you exactly found what I wanted... Just for information: the pfilt exposure corrections do not help in my case because the tone-mapping that is done in the HDR2LDR conversion (with hdr2jpeg / ra_tiff or similar) does the tone mapping for each single frame independent from the other images. (But maybe I just got something terribly wrong here...!?) Thanks! David 2013/10/22 Jack de Valpine <[email protected]> > 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 Incorporatedwww.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 > > > > _______________________________________________ > Radiance-general mailing > [email protected]http://www.radiance-online.org/mailman/listinfo/radiance-general > > >
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