Hi, I made a quick test with one topographic map in png format. I am not sure if I saw offset, but sure images look a bit different. In this case the native system seems to make some antialiasing while Add-Sextante-Raster-Image doesn't. I will do some further tests later.
-Jukka- -----Alkuperäinen viesti----- Lähettäjä: Sunburned Surveyor [mailto:sunburned.surve...@gmail.com] Lähetetty: ti 24.2.2009 17:23 Vastaanottaja: OpenJump develop and use Aihe: Re: [JPP-Devel] image data and vector data (pirol image loader bug?) Stefan, I'm not sure why you would be getting a 1 or 2 pixel offset. I'm wondering when it would be worthwhile to tackle comprehensive support for rasters in OpenJUMP. It seems like we are always trying to get some raster plug-in form a third party to work well in OJ. :] Just thinking out loud... SS On Sun, Feb 22, 2009 at 7:45 PM, Stefan Steiniger <sst...@geo.uzh.ch> wrote: > Hei, > > I just added the possibility to loaded images with the classes from > Pirols/Jan Ruzicka's using the new dialog (look for option Add Sextante > Raster Image). This was done to be able to use the raster analysis > functions from Sextante in future. > > While testing with an image that was derived from vector data (using OJ) > and loading the images with this new one and the old build-in loader > (done by Jon) I realized that the Pirol Image loader introduces an offset. > Not sure why this is, since it only "reads" the reference info from > worldfile - but there is clearly an offset of about 1-2 pixels between > both loaders. I assume that the build-in version is correct, since the > edges are better overlapping with the vector data. > > Any comments/suggestions or further tests with other data? > (I'm a bit tired now - to figure out what happens. So this email is > rather a warning for people that digitize based on images.) > > cheers, > stefan > > ------------------------------------------------------------------------------ > Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA > -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise > -Strategies to boost innovation and cut costs with open source participation > -Receive a $600 discount off the registration fee with the source code: SFAD > http://p.sf.net/sfu/XcvMzF8H > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
