[Gdal-dev] MrSID, ECW formats unusable when RasterIO is used - GDAL 1.3.1

[Frank Warmerdam]

On 1/18/06, Sergey Malgin <smalgin at esri.com> wrote:
> It looks like RasterIO method doesn't use MrSID multiresolution support. It
> takes 80 seconds to get data from 3.5MB SID file. I am trying to get full
> extent with output dimensions set to approx. 500x500 pixels.

Sergey,

There were some quirks with multiresolution level selection that may
have still existed in the code in 1.3.1.  You might want to try a nightly
snapshot of GDAL and see if the problem persists.  If it does, please
submit a minimal program, a file and any supported needed details
for me to reproduce the problem.

> 2. ECW problem.
>
> I have 2.5GB ECW. It shows full extent very fast, but when I zoom in a
> little, I get back blank image! If I continue to zoom in, eventually I get
> the data from lowest pyramid level.

I haven't encountered anything like this.  Once again, I
would suggest you try a nightly snapshot.  What version of
the ECW SDK are you using?

Best regards,
--
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