On Sun, Sep 13, 2009 at 5:48 AM, Niels Kristian Bech Jensen <[email protected]> wrote: >> From: [email protected] >> To: [email protected] >> Date: Sat, 12 Sep 2009 18:56:38 +0200 >> Subject: Re: [UFRaw-Devel] AHD interpolation and maze/mosaic artifacts >> >> In the following file, it's especially apparent in the grey border of >> the chart: >> >> http://files.pcode.nl/temp/IMG_4500.CR2 >> >> Using VNG4 completely fixes the issue. >> > Thanks for the image file. > > I have searched for explanations of the maze effect and it seems to be a > common problem with AHD interpolation (and similar algorithms). Some people > suggests that it happens when the green channel is either underexposed or > clipped - or when the two green channel values are too different to be > handled as one. Other suggests it is luminance noise being interpolated. > > The developers of perfectRAW are working on new interpolation algorithms and > some code to equilibrate the green channels > (http://www.ojodigital.com/foro/perfectraw-perfectblend/257378-labyrinth-artefacts-green-equilibration.html). > You can find their main discussion forum here (much of it is in Spanish > which is not my main language): > http://www.ojodigital.com/foro/perfectraw-perfectblend/
They seem to have solved the issue for AHD as well: http://img88.imageshack.us/img88/719/patternnoisehj42zu5.jpg Regards, Pascal de Bruijn ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ ufraw-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ufraw-devel
