Hei Jukka, thank you for the analysis. This helps to know where to resolve the issue.
stefan Rahkonen Jukka wrote: > Hi, > > I made a few more tests and here are my bit uncertain results: > > 1) OpenJUMP "Save to image" is creating a correct world file and maps > created this way have correct georeferencing. > 2) Save to image is creating .pgw world file for png images which is the > original ESRI way and correct in that sense. Funny, but OpenJUMP itself > can't utilile .pgw world files with the native (or Vivid?) image reader > but they need to be renamed as .tfw. This should be corrected either by > changing image export so that it creates both .tfw and .pgw named world > files, or by making Vivid image reader to accept also .pgw world files. > I did not check what is the situation with jpeg images and .jgw world > files. > 3) Native image reader shows images a bit softened but the orientation > of the opened images is probably correct. I did see an quarter pixel > offset in one test but no offset in another. Some other viewers like > OpenEV are softering the image in a similar way and I think it is not a > bug. Obviously some programmers like it more softened and some as sharp. > 4) I am pretty sure that Add-Sextante-Raster-Image does not locate > images correctly. It seems to introduce an offset of exactly one image > pixel both to the right and towards the bottom. > > -Jukka Rahkonen- > >> Stefan Steiniger wrote: >> >> @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?). >> >> > > ------------------------------------------------------------------------------ > 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
