Selon Jonathan Moules <[email protected]>: > I'm wondering - is there a reason that the JP2Open is distributed with > QGIS/GDAL given it seems to do a terrible job? At least it does with all > the ones I've tested against. Could the JP2ECW be distributed as the > default instead?
It depends on the images. On tiled JPEG2000, the OpenJPEG library is usable, although admitedly much slower than JP2ECW or JP2KAK. On single tile JPEG2000 images, the performance of OpenJPEG is really terrible since it will decompress the whole image even if a subwindow is asked. I'm sure the OpenJPEG developers would welcome funding and/or patches to improve the performance of the library. We need a performant free and open source JPEG2000 decoder. The proprietary alternatives are workaround. > > (again, I'm using the weekly build here). > Cheers, > Jonathan > > > > On 18 December 2013 15:35, Andre Joost <[email protected]> wrote: > > > Am 17.12.2013 20:47, schrieb Jukka Rahkonen: > > > > > > > >> If there are several drivers for JPEG2000 GDAL is using the first on the > >> list. You can skip a driver by setting GDAL_SKIP environment. Thus, if I > >> would like to have a try with JP2OpenJPEG I should run SET > >> GDAL_SKIP=JP2ECW > >> first. No idea really how and where I should do it so that QGIS starts > >> with > >> that setting. > >> > > > > From the menue, Settings -> Options, GDAL tab, lets you select or deselect > > every driver. QGIS 2.0.1 32bit standalone has JP2ECW and JP2Open, while > > OSGEO4W QGIS-dev only has the second one, unless you loaded the ecw package > > separately. > > > > Greetings, > > André Joost > > > > > > _______________________________________________ > > Qgis-user mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/qgis-user > > > > -- > This transmission is intended for the named addressee(s) only and may > contain sensitive or protectively marked material up to RESTRICTED and > should be handled accordingly. Unless you are the named addressee (or > authorised to receive it for the addressee) you may not copy or use it, or > disclose it to anyone else. If you have received this transmission in error > please notify the sender immediately. All email traffic sent to or from us, > including without limitation all GCSX traffic, may be subject to recording > and/or monitoring in accordance with relevant legislation. > _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
