<div dir="ltr">Dear all,<div>I was always thinking that JPEG doesn't support transparency so that it would not be possible to convert a 4 bands GeoTIFF using JPEG compression (without using internal binary mask).</div><div><br></div><div>However, I just did a gdal_translate -ot byte -scale -CO COMPRESS=JPEG 4bands.tif rgba_jpeg.tif and it "worked". </div><div><br></div><div>The gdalinfo output on the new file reports 4 bands dataset with Gray,Green,Blue,Alpha colors.</div><div><br></div><div>Does the TIFF specification allows that?</div><div>I still have to read it again to check if/how alpha and JPEG compression are related, but I'm wondering if you have any feedback on this topic in order to understand if a "standard" GeoTIFF reader should be able to deal with that or not and how to deal with the Alpha band (which at this point would be a Lossy band, containing artifacts).</div><div><br></div><div>Feedbacks are welcome.</div><div>Regards,</div><div>Daniele</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr">Regards,</div><div dir="ltr">Daniele Romagnoli</div><div dir="ltr">==</div><div dir="ltr">GeoServer Professional Services from the experts! Visit <a href="http://goo.gl/it488V" target="_blank">http://goo.gl/it488V</a> for more information.</div><div dir="ltr">==</div><div dir="ltr"><br></div><div dir="ltr">Ing. Daniele Romagnoli</div><div dir="ltr">Senior Software Engineer</div><div dir="ltr"><br></div><div dir="ltr">GeoSolutions S.A.S.</div><div dir="ltr">Via di Montramito 3/A</div><div dir="ltr">55054 Massarosa (LU)</div><div dir="ltr">Italy</div><div dir="ltr">phone: +39 0584 962313</div><div dir="ltr">fax: +39 0584 1660272</div><div dir="ltr"><br></div><div dir="ltr"><a href="http://www.geo-solutions.it" target="_blank">http://www.geo-solutions.it</a></div><div dir="ltr"><a href="http://twitter.com/geosolutions_it" target="_blank">http://twitter.com/geosolutions_it</a></div><div dir="ltr"><br></div><div dir="ltr">-------------------------------------------------------</div><div dir="ltr">AVVERTENZE AI SENSI DEL D.Lgs. 196/2003</div><div dir="ltr">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.</div><div dir="ltr"> </div><div dir="ltr">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.</div><div><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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