<div dir="ltr">Hi Even,<div>my usual question would be: any plan to backport it? :-)<br></div><div><br></div><div>Cheers,</div><div>Daniele</div><div><br></div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Aug 7, 2016 at 10:38 PM, Even Rouault <span dir="ltr"><<a href="mailto:even.rouault@spatialys.com" target="_blank">even.rouault@spatialys.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">Le dimanche 07 août 2016 19:20:05, Even Rouault a écrit :<br>
> Le samedi 06 août 2016 15:20:54, Fernando Ribeiro a écrit :<br>
> > Dear list,<br>
> ><br>
> > Currently we are working with 4 band tifs, first 3 bands as normal RBG<br>
> > and the 4th as IR. On performing a warp operation from and to a VRT,<br>
> > GDAL seems considering the 4th band as alpha, resulting in full black<br>
> > pixels if 4th band value =0.<br>
><br>
> gdalwarp will consider the 4th band as alpha... only if it is effectively<br>
> tagged as alpha in the source. You can check it with gdalinfo<br>
><br>
> > Some attempts were made to solve this issue, so far without success:<br>
> ><br>
> > - Using the warp creation options PHOTOMETRIC=RGB and ALPHA=NO<br>
><br>
> This will not influence the warping kernel.<br>
><br>
> > - Manually editing the source VRT and replace Alpha color interpretation<br>
> > to Undefined<br>
><br>
> This one should work. Strange that this doesn't work for you.<br>
><br>
> > Does anyone have more suggestions?<br>
<br>
</span>I've just committed an improvement in trunk: "gdalwarp: add a -nosrcalpha<br>
option to wrap the alpha band as a regular band and not as the alpha band"<br>
<div class="HOEnZb"><div class="h5"><br>
> ><br>
> > Thank you<br>
<br>
--<br>
Spatialys - Geospatial professional services<br>
<a href="http://www.spatialys.com" rel="noreferrer" target="_blank">http://www.spatialys.com</a><br>
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