@Jukka, thank you for testing. I also noticed the antialiasing effect. I discoverd the pixel shift by saving a vector graphics (with OpenJUMP) as image, and then did load this images with both options. Would be good to hear if you don't see a shift with "real" image data (if that would be true, then it may be something that relates to image scaling and rounding errors?).
@Sunburned: Well, you are right and wrong. The first image support came with JUMP 1.2 and I included it for compatibility. It uses JAI. The second image support, added the last days, comes from Pirol since this implementation (based on JAI too) is accessible to do raster algebra operations. I implemented it to allow a direct connection with Sextante, which provides a lot of raster analysis functions. Hence, I am not going to include any raster analysis functionality by now, since it is provided by Sextante, but only added the necessary visualisation and navigation options (i.e. the pirol image layer context menu). However, I did this also since I deem some basic raster analysis functions provided by Sextante necessary for every Desktop GIS - when looking on what people get taught at the university in geography, (landscape) ecology, environmental sciences and so on... I know, for a surveyor vector data is the major data type - but these disciplines are keen on raster data (probably because they do not have the archives yet, and lots of the information is pulled from some sort of aerial images - also involving infrared and other thermal information = fuzzy boundaryobjects) Hope you understand these both points... stefan Rahkonen Jukka schrieb: > 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 > > ------------------------------------------------------------------------------ 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
