Peter Hopfgartner <peter.hopfgartner <at> r3-gis.com> writes:
> I finally took the time to have a better look at this. > > The attached patch is only for our special case, where data arrives in 8 > bit bands and is certainly far from being decent (I've written my last > C++ code approx. 15 years ago). Anyway, the image quality seems indeed > to improve sensibly. > > I used the current SVN version as a base for the development. > > Applying the patch I get from > > https://dl.dropboxusercontent.com/u/4935329/resampling_tests /basemap.2000x2000-quasiorig.jpg > to this > > https://dl.dropboxusercontent.com/u/4935329/resampling_tests /basemap.2000x2000.bilinear.jpg Hi Peter, The improvement in quality is big, from almost unusable into rather good. One more thing came into my mind because you said you are going to use this for cascading tiles with Mapserver. From the Mapcache documentation http://mapserver.org/mapcache/config.html I understood that this product of Mapserver family can also do bilinear resampling: <full_wms>assemble</full_wms> <!-- resample mode filter applied when resampling tiles for full wms requests. can be either: - nearest : fastest, poor quality - bilinear: slower, higher qulity --> <resample_mode>bilinear</resample_mode> It might be interesting for you to compare the code, speed and quality with your solution. -Jukka Rahkonen- _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
