https://bugzilla.wikimedia.org/show_bug.cgi?id=17505
--- Comment #2 from [email protected] 2009-02-17 20:17:28 UTC --- 1) I am not aware of any patent issues with either the two file formats or tone mapping operators. 2) If by "working" you mean libraries for reading the file formats: * You don't need any for RGBE because the file format is trivial. * There is a library to read OpenEXR. The OpenEXR home page [1] says "ILM has released OpenEXR as free software. [...] The OpenEXR software distribution is now licensed under the modified BSD license" If you mean libraries for tone mapping: * qtpfsgui [2] is a software under GPL which includes different tone mapping operators, but the implementation may be of doubtful quality. * Many of the so-called "global" tone mapping algorithms such as [4] or [5]/[6] are easy to implement on your own because they just apply a logarithm-like formula over each pixel. The source code in [6] has very liberal licensing terms. If you mean programs to display HDR images, there is HDR View, OpenEXR Viewer, Jahplayer or Adobe Bridge, to name a few. 3) Global tone mapping algorithms are quite fast because they work independently over each pixel, and a good compiler can make use of SIMD. According to [3], Ward's scale factor [4] is the fastest, and took ~1 second to render a 1,600 x 1,200 image on an Apple iBook G3 running at 800 MHz. [1] http://www.openexr.com/ [2] http://qtpfsgui.sourceforge.net/sfproject.php [3] Erik Reinhard et al.: "High Dynamic Range Imaging", p. 358. Morgan Kaufmann, 2006. [4] Greg Ward: "A contrast-based scalefactor for luminance display", in "Graphics Gems IV", pp. 415-421. Academic Press Professional, 1994. [5] http://www.cs.utah.edu/~reinhard/cdrom/source.html [6] http://www.cs.ucf.edu/~reinhard/Reinhard02/ -- Configure bugmail: https://bugzilla.wikimedia.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. You are on the CC list for the bug. _______________________________________________ Wikibugs-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/wikibugs-l
