Le dimanche 07 août 2016 19:20:05, Even Rouault a écrit : > 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?
I've just committed an improvement in trunk: "gdalwarp: add a -nosrcalpha option to wrap the alpha band as a regular band and not as the alpha band" > > > > Thank you -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
