I have an RGB GeoTIFF file and I want to convert a specific RGB colour to transparent. I would like to use GDAL for doing this, but external Python scripts are also an option (though I haven't learned ...
I'm starting to use QGis 1.8.0. I have a raster topographic map, i.e. white background and black contour lines, houses, roads and so on. I want to make transparent the white background, so if I ...
Trying to generate a vector-based PDF map, which includes transparencies, for quality purposes. However, I'm finding that transparencies get rasterized instead and is lower quality. Is there any ...
I'm trying to create a map that has a all layers within a subject area having 0% transparency (full opaque), while features outside that area (defined by a polygon shapefile) having a reduced ...
Can the white background of the r.out.png of GRASS be changed to transparent?