On 03/21/2014 01:21 PM, Niels Kristian Bech Jensen wrote: > > Date: Fri, 21 Mar 2014 08:05:49 +0000 > > From: x...@xsdg.org > > To: ufraw-devel@lists.sourceforge.net > > Subject: [UFRaw-Devel] Seeing zipper artifacts with X-T1 (x-trans) > raw files > > > > Howdy, y'all > > > > I'm planning on picking up a Fuji X-T1 soon, and so I'm trying to figure > > out what my workflow will look like. > > > > So, current state of affairs: > > I downloaded this as a test file: > > > http://img.photographyblog.com/reviews/fujifilm_x_t1/photos/fujifilm_x_t1_11.raf > > From here: http://www.photographyblog.com/previews/fujifilm_x_t1_photos/ > > > > I have installed the latest dcraw and the latest ufraw from Debian's > > unstable repository: > > $apt-cache policy ufraw > > ufraw: > > Installed: 0.19.2-2 > > Candidate: 0.19.2-2 > > Version table: > > *** 0.19.2-2 0 > > 500 http://mirrors.usc.edu/pub/linux/distributions/debian/ > > unstable/main amd64 Packages > > 500 http://mirrors.kernel.org/debian/ unstable/main amd64 Packages > > 100 /var/lib/dpkg/status > > > > $apt-cache policy dcraw > > dcraw: > > Installed: 9.19-1.1 > > Candidate: 9.19-1.1 > > Version table: > > *** 9.19-1.1 0 > > 500 http://mirrors.usc.edu/pub/linux/distributions/debian/ > > unstable/main amd64 Packages > > 500 http://mirrors.kernel.org/debian/ unstable/main amd64 Packages > > 100 /var/lib/dpkg/status > > > > > > WHAT HAPPENS: > > If I try to open the sample file with ufraw, ufraw segfaults. > > > > If I try to open the sample file with dcraw, it works fine and spits out > > an image > > > > I then compiled the CVS version of ufraw. If I try to open the sample > > file with the CVS ufraw, it opens, but I see zipper artifacts. I'm > > confused, though, since dcraw.cc has > > #define DCRAW_VERSION "9.20" > > > > > > So first things first, how do I get rid of the zipper? > > > > Beyond that, it looks like everything other than full-res has a strong > > color cast (Green, in my case). I presume that is the issue mentioned > here: > > http://sourceforge.net/p/ufraw/discussion/434060/thread/99c10c54/#1539 > > > > I note that dcraw's half-scale output works fine. i.e., the following > > commands produce images that appear identical, but have different scales: > > $dcraw -v -T -w fujifilm_x_t1_11.raf > > $dcraw -v -T -w -h fujifilm_x_t1_11.raf > > > Yes. There are still some problems (zipper effect, color casts, spurious > segfaults) to iron out in the UFRaw X-Trans support but I have not had > the time to look into it.
Coming soon, I will probably have sufficient motivation to poke at and try to fix things. Does ufraw have an independent implementation of the X-Trans demosaic algorithm as compared to dcraw? If so, is it at least based on the dcraw algorithm? My belief to this point has been that UFRaw was basically a frontend to most of the processing happening in dcraw. Is that not accurate? Basically, I figured that UFRaw would do the half-scale demosaic do PPM or TIFF, cache that, do preview actions against that, and then repeat the preview actions against the full-scale demosaic on final output. --xsdg ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ ufraw-devel mailing list ufraw-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ufraw-devel
