Hello! I have a four band raster, which is RGB raster with transparency (alpha) channel. In raster calculator they are listed as: "bbb@1" "bbb@2" "bbb@3" "bbb@4"
I'd like to change the values of cells in "bbb@4" channel (the alpha channel) in the following way: if value of the cell is smaller than 255, change it to 0 if it is 255, leave it unchanged I do not want to change values of other channels. And as a result, i'd like to have also a 4-band raster. Would someone help me to create a rater calculator expression to get desired result? Darek Bobak -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Change-value-of-alpha-band-in-multiband-raster-tp5143418.html Sent from the Quantum GIS - User mailing list archive at Nabble.com. _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
