On Thu, Jan 17, 2013 at 1:47 PM, "Nico Wöhrle" <[email protected]> wrote: > Hello everyone, > > I recently discovered a bug when converting images from RAW to JPG with > Darktable (happens with 0.9.x as well as with the 1.2 version) on Linux Mint > 13: > > The images, which I reworked with things like cropping, white balance, > denoising, etc, come out a lot noisier than they look as RAW files inside > darktable. With "a lot" I mean, that it looks like somebody pushed the ISO to > 25600. It doesn't matter into which file format I export them (jpg, png or > tiff). > But: This only happens when I view them with Mint image viewers (e.g. the > Gnome image viewer). When I open the same images with Gimp in Mint or with > any software on a Windows system, the images look perfectly like the RAW > files inside darktable. > > Can someone help me on that?
This is totally expected and has absolutely nothing to do with Darktable. Different software uses different image resampling algorithms (to go from full resolution to screen resolution), and they are all imperfect. They are all a mix of slow/fast sharp/blurry and artifact prone or not. Most image editing software like GIMP / Darktable uses slower higher quality algorithms (bicubic/lanczos). Most image viewing software uses faster low quality algorithms, which typically are either blurry (bilinear), and sharp but artifact prone (nearest). And you're noticing this last bit. On fast computers the speed difference between algorithms may not be as noticeable, but for example on netbooks with large files this may be quite noticeable. Regards, Pascal de Bruijn ------------------------------------------------------------------------------ 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_122712 _______________________________________________ darktable-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-devel
