Hallöchen! johannes hanika writes:
> On Thu, Jan 3, 2013 at 11:29 PM, Torsten Bronger > <bron...@physik.rwth-aachen.de> wrote: > > [...] > >> Here are the results of benchmarking: >> >> [...] > > these values look very reasonable.. > >> I had problems making the reference HDR because of >> http://www.darktable.org/redmine/issues/8695 so I created it with >> LuminanceHDR. I tried to set all gammas and EVs correctly, but >> probably this introduces an offset in luminance. The values in >> the above table should remain comparable relatively to each >> other, though. (If I understood benchmarking correctly at >> least.) > > .. and surprisingly so, if you created that hdr in luminance. > > the reference should not be a hdr image, but the simple average of 3-4 > low-iso shots at the _same_ exposure. I did use pictures with the same exposure parameters. I merely (ab)used Luminance HDR for this instead of Darktable. What I meant was that I tried to have the same overall brightness in the reference image as in the others, but could not guarantee that. > [...] moreover, you want to make sure these are processed the same > way (all linear, no gamma, no tonemapping, no different highlight > handling and whitebalance etc). This is what I cannot guarantee. I don't really know what Luminance HDR does internally. Tonemapping was not involved. I fiddled with the settings until I got a reasonable output. (No sliders, only discrete settings.) >> All benchmarking images are out-of-focus, too. Was this correct? > > doesn't matter, they just have to match, as we're computing pixel > differences to find the PSNR. I just thought that even the best tripod cannot guarantee pixel-level matching, and that this is a problem. And, structures with a frequency similar to the noise (worst case would be a moire) would spoil the calculation. Tschö, Torsten. -- Torsten Bronger Jabber ID: torsten.bron...@jabber.rwth-aachen.de or http://bronger-jmp.appspot.com ------------------------------------------------------------------------------ Master HTML5, CSS3, ASP.NET, MVC, AJAX, Knockout.js, Web API and much more. Get web development skills now with LearnDevNow - 350+ hours of step-by-step video tutorials by Microsoft MVPs and experts. SALE $99.99 this month only -- learn more at: http://p.sf.net/sfu/learnmore_122812 _______________________________________________ darktable-devel mailing list darktable-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/darktable-devel
