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2
votes
2answers
2k views

GDAL: Convert specific RGB (GeoTIFF) color to transparent

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 ...
6
votes
3answers
1k views

How to make transparent the background of a topographic map in QGis 1.8.0?

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 ...
4
votes
2answers
642 views

Transparency for PDFs in Arc

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 ...
6
votes
2answers
427 views

How to alter transparency by spatial location

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 ...
3
votes
1answer
380 views

Graphic with transparency in ArcGIS 10.1 layout does not export properly in PDF Export

I am trying to export a pretty simple map to PDF and finding the results are not what I expect. I have inserted two graphics on top in Layout. One is just a rectangle that has a custom user style ...
3
votes
1answer
380 views

How to make a transparent background image using r.out.png?

Can the white background of the r.out.png of GRASS be changed to transparent?