On Mon, Jul 04, 2011 at 12:16:52PM -0400, John Sessoms wrote: > From: steve harley > >On 2011-07-02 19:47 , Bruce Walker wrote: > >>> How about just not worrying about it too much, but allow a touch more > >>> framing room when you shoot, then level it up during post-processing. > >>> It's trivial in Lightroom and just a little more work in Photoshop. Most > >>> packages have some sort of leveling functionality (maybe even iPhoto?). > > > >note that you lose a little bit of resolution anytime you make such an > >adjustment; in the majority of cases it may not matter, but it's > >something a lot of people don't realize > > > > Do you lose resolution, or do you just lose some pixels along the > edges of the captured image? > > The K20D viewfinder only shows about 95% of the image frame, so > there's always a little slack around the edges of the image I > composed. > > An arbitrary rotation of a couple of degrees to level out the > horizon has never cost me pixels in the composed image itself. It's > always been confined to the area around the edge that I couldn't see > through the viewfinder.
It doesn't cost you (many) pixels, but it does cost you resolution. Because the pixels don't line up exactly, every pixel in the output image is interpolated from a neighbourhood of pixels in the source. That's basically very similar to blurring the image slightly, which shows up mathematically as a slight decrease in resolution. Don't fret about it unduly - you get the same sort of loss when you resize images (and in the Bayer interpolation, for that matter). -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
