> > OpenJPEG begins to be fast enough for practical use with tiled JPEG2000. > Unfortunately it is almost unusable with single tile images like the ones > in the directory below. Images are open data, only attribution required: > National Land Survey of Finland, 2014. > > http://kartat.kapsi.fi/files/orto/etrs-tm35fin/mavi_vv_25000_50/2014/M52/10 > m/1/ > > Let's hope that OpenJPEG developers will discover some day how to read > single-tile images at reasonable speed.
Yes that sums up to have opj_set_decode_area()+opj_decode() work efficiently. Currently GDAL uses that API if there's a single-tile. Otherwise it uses the opj_get_decoded_tile() API to decode tile per tile. This should be better discussed on their channel ( https://groups.google.com/forum/#!forum/openjpeg ). > Now I cannot imagine that I would > use OpenJPEG driver even for converting such images with gdal_translate. > There is a free-as-in-beer solution by using JP2ECW read-only driver for > JPEG2000->GeoTIFF conversion followed by use of JP2OpenJPEG driver for > GeoTIFF->tiled JPEG2000 but that does not make my open source minded soul > happy. Yes, and that causes further quality loss. > > -Jukka Rahkonen- > > > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
