[Gdal-dev] Wanted: More speed to JPEG2000

[Frank Warmerdam]

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,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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