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Thank you Axel. I have tried this but from WebHDR, I do not seem to be able to save my picture as RGBE file (.hdr). There is only an option to save it as either *.jpg or *bmp. I clicked on all I could see that resembles what you describe but the only thing it returns is a text file? Please give me some tips if you have... Thank you. <><><><><><><><><><><><> Marie-Claude Dubois, M. Arch. PhD ________________________________________ Från: Axel Jacobs [[email protected]] Skickat: den 20 augusti 2014 09:06 Till: High Dynamic Range Imaging Ämne: Re: [HDRI] Radiance ximage viewer Marie-Claude, the JPG images that WebHDR generates are in a special HDR format that Greg developed. They are essentially 'normal' JPEGs, but with a clever HDR header bolted to them. With almost all image editing software, the HDR info is lost or ignored. You should use the RGBE file (.hdr) the WebHDR also generates. There is a Windows HDR viewer called HDRView that was developed by Paul Debevec. It is no longer available on his web site, but you can still find it through a Google search. HDRView displays the pixel's RGB under the cursor in the status line. I am not sure if this takes into account the exposure value, but do give it a try. If nothing else, it's a small and very fast HDR viewer for Windows. If you know the pixel coordinates for which you need the luminance, you could also extract it with pvalue, although this generates rather large text files. Unfortunately, you don't get the UNIX text processing commands on Windows, but some are available as extra downloads. The 'grep' command is pretty handy for filtering out exactly what you need. Best Axel On 20/08/14 07:53, Marie-Claude Dubois wrote: > -------- > WARNING: At least one of the links in the message below goes to an .exe file, > which could be malicious. To learn how to protect yourself, please go here: > https://commons.lbl.gov/x/_591B > -------- > > Thank you for the quick answer Robert. > I am (unfortunately) still working with Windows...I managed to discover > rvu.exe on my DIVA\Radiance\bin installation. The simple "t" command works > very well when I use a *.pic file as input (a file generated in a Radiance > simulation). However, now I am trying to use a *jpg image generated with > WebHDR and this does not work. > What should I do? I need to be able to pick pixles in this image to check if > my luminance measurements match with parts of the scene. > Please give me some tips.... > Thx > > <><><><><><><><><><><><> > Marie-Claude Dubois, M. Arch. PhD > <><><><><><><><><><><><> > > ________________________________________ > Från: Guglielmetti, Robert [[email protected]] > Skickat: den 19 augusti 2014 17:28 > Till: High Dynamic Range Imaging > Ämne: Re: [HDRI] Radiance ximage viewer > > -------- > WARNING: At least one of the links in the message below goes to an .exe file, > which could be malicious. To learn how to protect yourself, please go here: > https://commons.lbl.gov/x/_591B > -------- > > NOTE: > Uhm, yeah, so, I forgot, we don't actually build image for Windows. Sorry > about that! Since image relies on the X11 driver, it would require a re-write > (using Qt or some other cross platform display driver) to work on Win. So we > punted on that one. > > All is not lost for Windows users, though. We *did* port rvu to Windows, and > you can use that to pick luminance values from pixels, instead. > > - Rob > > On 8/19/14, 8:50 AM, "Guglielmetti, Robert" > <[email protected]<mailto:[email protected]>> wrote: > > For Windows, I think you'd have to run the installer, but you could always > just install it to a secondary location and copy ximage.exe to your usual > location, then delete this second install without messing about with paths. > Windows installer: > https://github.com/NREL/Radiance/releases/download/4.2/radiance-4.2-win32.exe > > > > _______________________________________________ > HDRI mailing list > [email protected] > http://www.radiance-online.org/mailman/listinfo/hdri > > _______________________________________________ > HDRI mailing list > [email protected] > http://www.radiance-online.org/mailman/listinfo/hdri > _______________________________________________ HDRI mailing list [email protected] http://www.radiance-online.org/mailman/listinfo/hdri _______________________________________________ HDRI mailing list [email protected] http://www.radiance-online.org/mailman/listinfo/hdri
