On Mon, Nov 21, 2016 at 5:52 PM, Niels Charlier <ni...@scitus.be> wrote:
> > Strangely enough, this doesn't happen with a single image (or smaller > mosaic). The only difference I can see, is in the X and Y offset values > of the image and the affine transformation. > > This is the picture before the operation: > http://www.scitus.be/temp/original.png > this is the good result http://www.scitus.be/temp/good.png > and the bad result http://scitus.be/temp/bad.png > > Underneath this email I am also putting the planar image and warp > transform details (but as you will see, only x and y offset are different). > > Do you have an idea what could cause this kind of distortion? I am now > strongly suspecting this a bug in JAI and not resolvable in geotools, > would that be possible? > > Also, the whole block of code can be avoided by setting the system > property org.geotools.image.reduceWarpAffine=false > What would be the potential disadvantage of that? (The code must be > there for a reason... Is this just a performance thing...?) > Yes, a significant one under load testing, as it avoids the generation of one level of tiles in the chain, thus reducing both computation and load on the tile cache. So by turning it off you get the good looking results? It might be due to image layout difference, do you see any between the normal "warp and then affine" case compared to the reduced warp/affine? Also, I'd suggest to have a look at the code on master, I've made changes there, is the issue still showing up after those changes. Cheers Andrea -- == GeoServer Professional Services from the experts! Visit http://goo.gl/it488V for more information. == Ing. Andrea Aime @geowolf Technical Lead GeoSolutions S.A.S. Via di Montramito 3/A 55054 Massarosa (LU) phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339 8844549 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. -------------------------------------------------------
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