[Radiance-general] Tone mapping for animation

[Rob Guglielmetti]

Hi all,

Yeah, it is a little unclear what you want. On the one hand if you want what a camera would do with fixed aperture and shutter speed, Jack's option one is correct. If you want to tonemap, we assume you want something like what we would see at each visual environment, and then jacks option two is the way to go. Phisto is very cool. Yet another one of those tools that make you realize how dense these Radiance images are!

-Rob

> On Oct 22, 2013, at 8:05 AM, Jack de Valpine <jedev at visarc.com> wrote:
> 
> Hi David,
> 
> I am a little unclear on what you want to accomplish but here are a few thoughts.
> time series animation with constant exposure on successive frames - use pfilt -1 -e [constant exposure setting] for each frame
> 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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