[Qgis-user] Weekly builds and JP2 files

[Jonathan Moules]

Hi Jukka,
  I'm only seeing the JP2OpenJPEG in there (this is for the weeklies, I've
uninstalled my 2.0 so can't check that).

So I guess given the behaviour/speed difference that 2.0 comes with the
JP2ECW driver? Would it be much effort to add to the weeklies? Or is there
a way to for me to easily add it post-install?

Thanks,
Jonathan


On 17 December 2013 19:47, Jukka Rahkonen <jukka.rahkonen at mmmtike.fi> wrote:

> Jonathan Moules <jonathanmoules at ...> writes:
>
> >
> >
> > Anyone?
> >
> > On 11 December 2013 17:04, Jonathan Moules
> <jonathanmoules at warwickshire.gov.uk> wrote:
> > Hi List,
> > A question about the weekly builds (www.qgis.org/downloads/weekly). They
> seem to struggle with loading JP2 files using the usual raster dialog.
> First
> they're incredibly slow, but on top of that when they do load they tend to
> be some sort of horrible mess of lots of black of random colours in a
> griddish pattern or similar.
> >
> > Do the weekly builds not include a functional JP2 reader? The same
> rasters
> work just fine in the stable release 2.0.1.
>
> Hi,
>
> Check what drivers are baked into GDAL. In Windows you can go to QGIS
> Dufour
> directory, set the environment by running osgeo4w.bat and then you can list
> the JP2 drivers as
>
> C:\Program Files\QGIS Dufour>gdal_translate --formats |find "JP2"
>   JP2ECW (rov): ERDAS JPEG2000 (SDK 5.0)
>   JP2OpenJPEG (rwv): JPEG-2000 driver based on OpenJPEG library
>
> JP2ECW is fast and JP2OpenJPEG is sometimes almost usable. JP2KAK is very
> good but that you can't get without Kakadu license. JP2MrSID used to be
> fast
> also but I do not know what is the status with the license.
>
> 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.
>
> -Jukka Rahkonen-
>
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