[gdal-dev] Question on 0th IFD offset when producing a JPEG-Compressed GeoTIFF (GDAL 1.11 vs 2.x)

Tue Jan 10 02:00:19 PST 2017

Hi Even.
I'm back to the topic :)
Do you have any timeframe for the 2.2.x release?

Best Regards,
Daniele

On Fri, Dec 16, 2016 at 2:56 PM, Daniele Romagnoli <
daniele.romagnoli at geo-solutions.it> wrote:

>
>
> On Fri, Dec 16, 2016 at 2:48 PM, Even Rouault <even.rouault at spatialys.com>
> wrote:
>
>>
>>
>> > Right,
>>
>> > Indeed, before sending my previous email I have also tried with:
>>
>> > *gdaladdo -r average --config COMPRESS_OVERVIEW DEFLATE --config
>>
>> > PHOTOMETRIC_OVERVIEW RGB*
>>
>> > to understand if it was related to JPEG only but, even with these
>> options,
>>
>> > the output overviews were jpeg compressed (I assume there is some kind
>> of
>>
>> > coherency check in gdaladdo).
>>
>>
>>
>> With internal overviews, the _OVERVIEW configuration options are ignored.
>> Their value is deduced from the settings of the main IFD.
>>
> It makes sense, indeed.
>
>
>> I don't think there's a strong technical reason for that. Mostly a side
>> effect of the fact that there are slightly different code paths to handle
>> creation of internal and external overviews, and the reading of _OVERVIEW
>> config options is done only in the external overview code path.
>>
>>
>>
>> >
>>
>> > > I do reproduce something similar to your findings in 2.1 indeed. This
>> no
>>
>> > > longer happens in trunk due to related improvements (
>>
>> > > https://trac.osgeo.org/gdal/wiki/CloudOptimizedGeoTIFF), I made in
>> the
>>
>> > > last couple of weeks (using the same trick of creating a in-memory
>> TIFF
>>
>> > > file to get the JPEG tables and set them direcly on the overview IFD
>> at
>>
>> > > creation time).
>>
>> >
>>
>> > Do you think this will be available in other series or does it introduce
>>
>> > new API/major changes which makes it available on 2.2.x only?
>>
>>
>>
>> No API change, but this is in the improvement category rather than
>> bugfixing, and my first changeset resulted in some corrupted images in some
>> situations, which was unnoticed for a few weeks, so that's a sign that it
>> is a somewhat risky change (the GeoTIFF driver is a complex beast), not
>> worth the trouble of breaking stable branches.
>>
> Understood. thanks for the feedback.
> Cheers,
> Daniele
>
>
>>
>>
>> Even
>>
>>
>>
>> --
>>
>> Spatialys - Geospatial professional services
>>
>> http://www.spatialys.com
>>
>
>
>
> --
> ==
> GeoServer Professional Services from the experts! Visit
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> ==
>
> Ing. Daniele Romagnoli
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>
> GeoSolutions S.A.S.
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> 55054  Massarosa (LU)
> Italy
> phone: +39 0584 962313 <+39%200584%20962313>
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-- 
==
GeoServer Professional Services from the experts! Visit
http://goo.gl/it488V for more information.
==

Ing. Daniele Romagnoli
Senior Software Engineer

GeoSolutions S.A.S.
Via di Montramito 3/A
55054  Massarosa (LU)
Italy
phone: +39 0584 962313
fax:      +39 0584 1660272

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

-------------------------------------------------------

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Le informazioni contenute in questo messaggio di posta elettronica e/o
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principi dettati dal D.Lgs. 196/2003.

The information in this message and/or attachments, is intended solely for
the attention and use of the named addressee(s) and may be confidential or
proprietary in nature or covered by the provisions of privacy act
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immediately the sender by telephone, fax or e-mail and delete the
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