Le samedi 06 août 2016 15:20:54, Fernando Ribeiro a écrit : > Dear list, > > Currently we are working with 4 band tifs, first 3 bands as normal RBG > and the 4th as IR. On performing a warp operation from and to a VRT, > GDAL seems considering the 4th band as alpha, resulting in full black > pixels if 4th band value =0.
gdalwarp will consider the 4th band as alpha... only if it is effectively tagged as alpha in the source. You can check it with gdalinfo > > Some attempts were made to solve this issue, so far without success: > > - Using the warp creation options PHOTOMETRIC=RGB and ALPHA=NO This will not influence the warping kernel. > > - Manually editing the source VRT and replace Alpha color interpretation > to Undefined This one should work. Strange that this doesn't work for you. > > Does anyone have more suggestions? > > Thank you -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
