[Qgis-user] Weekly builds and JP2 files

[Jonathan Moules]

*Even,*
Thanks for the information. I agree with the ideal of a FOSS JP2 library
but we're not in a position to contribute towards it; at best it's
ancilliary to our needs. At worst I could use any one of a number of other
formats, it just so happens that for now the data is in JP2.

Jürgen,
Ok, thanks for the clarification, I didn't pick up on that before. These
are 32bit clients, so I guess we'll need to upgrade to see the change.

Cheers,
Jonathan

On 19 December 2013 15:47, Even Rouault <even.rouault at mines-paris.org>wrote:

> Selon Jonathan Moules <jonathanmoules at warwickshire.gov.uk>:
>
> > 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 <andre+joost at nurfuerspam.de>
> 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
> > >
> > >
> > > _______________________________________________
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> > >
> >
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