Pascal, I tried with your image but can't reproduce here. I imported into darktable with default settings (dithering is enabled then) and exported to JPEG (3000x3000 95%). All looks OK.
OTOH it's quite plausible what you describe. With Floyd-Steinberg values of a pixel depend on *all* pixels upper left to it. So if there is any NaN in the image all pixel bottom right will also tranfer to NaN's as all caclculations with an NaN operand always give an NaN result. I think it would be wise to clamp input pixel in module dithering prior to the processing. Open question is the source of the NaN in the first place on your system... Ulrich Am 06.01.2013 18:05, schrieb Pascal Obry: > > Ok, to reproduce: > > > https://www.transferbigfiles.com/cd074ea7-1a1d-4e75-816b-5b8a9afd1cd3?rid=9T46o9v4lSAU45x7c6GZxw2 > > Download the following image (41 Mb): > > On the darkroom mode activate the dithering module. > > On lightable just export as jpeg on disk (3000x3000, 95% quality). > > The image will be covered by a big black patch. Disable the dither > module, export again and all is well. > ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnmore_123012 _______________________________________________ darktable-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-devel
