[gdal-dev] JPEG 2000 layers GDAL

[Jayesh Chaudhary]

Thanks Even.

I realised that I was using OpenJPEG driver (some old version) which does
not support overviews. I intend to use MrSID which worked as expected.

Thanks a lot.



On Thu, May 17, 2012 at 2:09 PM, Even Rouault
<even.rouault at mines-paris.org>wrote:

> Le jeudi 17 mai 2012 20:04:30, Jayesh Chaudhary a écrit :
> > Folks,
> >
> > I have written a GDAl based reader and I am trying to read JPEG 2000
> > images. When I ran gdalinfo on one of the samples images from here:
> > http://www.openjpeg.org/index.php?menu=samples, it does not list
> subdataset
> > or overviews ( I was expecting overviews ).
>
> There are no concept of subdataset with JPEG2000 drivers, so this is
> expected.
>
> As far as overviews, it depends on the particular JPEG2000 driver that you
> uses. JP2ECW, JP2MrSID and JP2KAK should expose them. (JP2ECW exposes
> arbitrary overviews). But JP2OpenJPEG or JPEG2000 (Jasper based) drivers
> aren't sufficiently advanced to expose overviews.
>
>
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