I assume your -1 is intended to map to no data? No specical feedback, a warning that the existing image enhancement code fails when the top corner is out of bounds (perhaps this is fixed with the change to jai-ext). See GEOS-6213 <https://osgeo-org.atlassian.net/browse/GEOS-6213>
-- Jody Garnett On 3 August 2015 at 02:59, Daniele Romagnoli < [email protected]> wrote: > Hi List, > We are working on improving the SLD ContrastEnhancement support by adding > some more Normalize algorithm and support for input parameters. > > Current Normalize ContrastMethod simply maps raster min max to 0, 255. > We are going to add some more algorithms to Normalize such as > StretchToMinMax with support for Min,Max params so that you can specify > (min,max) range to be linearly mapped to 0,255. > > We would also like to support clipping/clamping. > In such a context we have taken a look around and we found that some tools > as QGIS define clipping by mapping values outside the specified range to -1 > whilst some other math tools define clipping like this: > ClipValueToMinMax(Value,Min,Max) = Value < Min ? Min : Value > Max ? Max : > Value, resulting in mapping values outside the range to Min and Max > respectively. > > What we can do is supporting both of them through 2 different algorithms > such as clamping to specified Min and Max and Clamping values outside the > specified range to 0, 255 (when dealing with bytes). > What do you think about it? > Do you have any experience on these clipping/clamping concepts to suggest > a good name for the 2 different approaches? > Something like ClampToMinMax vs ClipToZeroMax? > > Please, let us know. > Best Regards, > Daniele > > > > > > > > > > > -- > == > 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 Poggio alle Viti 1187 > 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. > > > > ------------------------------------------------------------------------------ > > _______________________________________________ > GeoTools-Devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geotools-devel > >
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