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 <[email protected]> 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 > [email protected] > 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 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.
_______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
