[gdal-dev] Troubleshooting palette management. Potential bug in palette for overviews?

Thu Mar 8 06:32:09 PST 2018

Hi Even,
I'm resurrecting this old post since I think we have (GeoServer) been hit
by that problem again (although I'm not 100% sure about that).
http://osgeo-org.1560.x6.nabble.com/Geotiff-pyramids-non-transparant-while-original-is-transparent-td5357343.html

Do you know if there is any plan to fix  https://trac.osgeo.org/gdal/
ticket/2213?

Best Regards,
Daniele

On Fri, Nov 25, 2016 at 12:14 PM, Daniele Romagnoli <
daniele.romagnoli at geo-solutions.it> wrote:

> JAI-ImageIO TIFFDecompressor does the same (Line 0888):
> https://java.net/projects/jai-imageio-core/sources/svn/
> content/trunk/src/share/classes/com/sun/media/imageio/
> plugins/tiff/TIFFDecompressor.java?rev=254
>
> (also putting an imageio-ext link for quicker reference)
> https://github.com/geosolutions-it/imageio-ext/
> blob/master/plugin/tiff/src/main/java/it/geosolutions/
> imageio/plugins/tiff/TIFFDecompressor.java#L900
>
> Note the:
> redLut[i] = (byte)((colorMap[i]*255)/65535);
> which results into using a 257 scale factor.
>
> Cheers,
> Daniele
>
>
> On Fri, Nov 25, 2016 at 11:27 AM, Ari Jolma <ari.jolma at gmail.com> wrote:
>
>> 24.11.2016, 18:01, Even Rouault kirjoitti:
>>
>>
>>
>> Could be worth fixing that if that cause issues (apparently in your use
>> case at least), but I'd be interested by information of what is the
>> standard/recommanded/best-practice-in-the-industry/etc... formulas to
>> use for the mapping between the [0,255] and [0,65535] ranges.
>>
>>
>> At least in the GTK circles it seems to be a standard practice to use the
>> 257 as the scaling factor. See for example
>>
>> http://gtk2-perl.sourceforge.net/doc/pod/Gtk2/Gdk/Color.html
>>
>> Ari
>>
>>
>>
>>
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>>
>
>
>
> --
> ==
> 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 <+39%200584%20962313>
> fax:      +39 0584 1660272 <+39%200584%20166%200272>
>
> http://www.geo-solutions.it
> http://twitter.com/geosolutions_it
>
> -------------------------------------------------------
>
> *AVVERTENZE AI SENSI DEL D.Lgs. 196/2003*
>
> Le informazioni contenute in questo messaggio di posta elettronica e/o
> nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il
> loro utilizzo è consentito esclusivamente al destinatario del messaggio,
> per le finalità indicate nel messaggio stesso. Qualora riceviate questo
> messaggio senza esserne il destinatario, Vi preghiamo cortesemente di
> darcene notizia via e-mail e di procedere alla distruzione del messaggio
> stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso,
> divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od
> utilizzarlo per finalità diverse, costituisce comportamento contrario ai
> 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
> (Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection
> Code).Any use not in accord with its purpose, any disclosure, reproduction,
> copying, distribution, or either dissemination, either whole or partial, is
> strictly forbidden except previous formal approval of the named
> addressee(s). If you are not the intended recipient, please contact
> immediately the sender by telephone, fax or e-mail and delete the
> information in this message that has been received in error. The sender
> does not give any warranty or accept liability as the content, accuracy or
> completeness of sent messages and accepts no responsibility  for changes
> made after they were sent or for other risks which arise as a result of
> e-mail transmission, viruses, etc.
>
>

-- 
Regards,
Daniele Romagnoli
==
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

-------------------------------------------------------
AVVERTENZE AI SENSI DEL D.Lgs. 196/2003
Le informazioni contenute in questo messaggio di posta elettronica e/o
nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il
loro utilizzo è consentito esclusivamente al destinatario del messaggio,
per le finalità indicate nel messaggio stesso. Qualora riceviate questo
messaggio senza esserne il destinatario, Vi preghiamo cortesemente di
darcene notizia via e-mail e di procedere alla distruzione del messaggio
stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso,
divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od
utilizzarlo per finalità diverse, costituisce comportamento contrario ai
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
(Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection
Code).Any use not in accord with its purpose, any disclosure, reproduction,
copying, distribution, or either dissemination, either whole or partial, is
strictly forbidden except previous formal approval of the named
addressee(s). If you are not the intended recipient, please contact
immediately the sender by telephone, fax or e-mail and delete the
information in this message that has been received in error. The sender
does not give any warranty or accept liability as the content, accuracy or
completeness of sent messages and accepts no responsibility  for changes
made after they were sent or for other risks which arise as a result of
e-mail transmission, viruses, etc.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20180308/4149896a/attachment-0001.html>