New answers tagged transparency
Clip dataframe by shape is not supporting for MapService because of the performance. So the performance reason, you would better to clip the raster data source directly. I guess you have Spatial Analyst extension license, then you could use "Extract by Mask" tool. http://resources.arcgis.com/en/help/main/10.1/index.html#//009z0000002n000000 Hope this help ...
The link below seems to be a similar question It gives a step by step guide to doing so. How to make transparent the background of a topographic map in QGis 1.8.0?
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