[Gdal-dev] Wanted: More speed to JPEG2000

Frank Warmerdam warmerdam at pobox.com
Wed Nov 29 01:08:44 EST 2006

Tom Lynch wrote:
> I can't comment about the tuning of the JP2KAK driver except to say it
> could probably perform a bit better.

Tom / Jukka,

This is definately the case.  The JP2KAK driver *only* supports a block
oriented access to data while the JP2ECW driver has an implementation of
the RasterIO() interface that will handle single large reads in a single
underlying library windowing which can make a big difference.

Differences in the performance of jpeg2000 access through the various
drivers in GDAL should not be taken as a reflection of the underlying
library efficiency.  More often it reflects varying implementation
strategies in GDAL.

Best regards,
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | President OSGeo, http://osgeo.org

More information about the Gdal-dev mailing list