id summary reporter owner description type status priority milestone component version resolution keywords cc cpu platform 3130 r.out.gdal: add alpha channel support neteler grass-dev@… "At time the export of RGB data with nodata is rather difficult. {{{ grass72 ~/grassdata/nc_spm_08_grass7/landsat # test case: # set region to be half off the NC Landsat scene: g.region n=226831.5 s=221188.5 w=626430 e=634467 res=28.5 -p d.mon wx0 d.rgb b=lsat7_2002_10 g=lsat7_2002_20 r=lsat7_2002_30 # yes, null is expected: r.univar lsat7_2000_30 -g | grep null null_cells=24750 r.out.gdal lsat7_2000 output=lsat7_2000_RGB.tif --o Checking GDAL data type and nodata value... 100% Using GDAL data type Input raster map contains cells with NULL-value (no-data). The value 0 will be used to represent no-data values in the input map. You can specify a nodata value with the nodata option. 100% ... }}} But in this case the 0 value is a data value and should not be used for nodata. The only solution seems to be an extra alpha channel to be stored in the resulting GDAL file (here: GeoTIFF). " enhancement closed normal 7.2.0 Docs svn-releasebranch72 fixed r.out.gdal, alpha Unspecified Unspecified