Hallöchen! Pedro Côrte-Real writes:
> On Wed, Jan 6, 2016 at 11:40 PM, Émile Cordonnier > <emile.cordonnier+darkta...@gmail.com> wrote: > >> I discovered that there are three "image" sizes in darktable >> (sizes with Canon 40D's cr2): >> >> (a) 3944x2622 which is showed in the information panel => it is >> in fact the sensor size (and maybe at some point an image size, >> but I never saw it in darktable) ; > > This is the image size of the files that we handle internally > (what the sensor captures) but it includes parts which are not > image data. This camera, like many others by Canon includes some > black parts of the image that are used for calibrating the black > point of the raw data. The reason it's displayed is that it's what > is encoded in the file. > >> (b) 3908x2602 is dt image size (when using the crop module or >> exporting to jpg) ; > > That's the full usable image size after we crop out everything > that's not actual image data. As a side note, different image sizes in dcraw and DT cause visible residual lens correction errors in some rare cases. I use dcraw's output for measuring distortion. When correcting in DT, I noticed that the correction was not perfect. Using dcraw's TIFF instead of the RAW in DT made it perfect. Once Lensfun supports different crop modes (e.g. Nikon DX/FX), the same technique can be used to solve this issue, too. Tschö, Torsten. -- Torsten Bronger Jabber ID: torsten.bron...@jabber.rwth-aachen.de ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Darktable-users mailing list Darktable-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/darktable-users
