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There's a plugin called "create mask" for qGIS and trying out some simple scripting from the Python console.

I would like to call it after I select the vector features I want, then do more related tasks afterwards. So, how does one run "create mask" from the console?

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I have no solution for doing this in python (you can easily call plugins with Sextante support, but i don't know how to call qgis plugins in general), but i highly advise you to take a look at the Sextante toolbox and its modeler. The SAGA extension for Sextante has a similar Mask creation function (Create Grid Mask). Using the Sextante modeler you can build processing chains without any script use.

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@ Thanks for suggesting this. I'm trying it out but couldn't find this "create grid mask" from the SAGA extension of Sextante. Am I supposed to install anything else? –  n1kn0k Mar 7 '13 at 22:59
    
If you installed Sextante and SAGA and have correctly linked the SAGA-Install dir in the Sextante options, then the function should appear as "Grid Masking". Is this what you want? I am not so sure anymore and the word mask has been used in many different contexts. –  Curlew Mar 7 '13 at 23:02
    
I can see that now "Grid Masking" but I'm encountering problems with SAGA and Ubuntu 12.04. An error pops out: "It seems that SAGA is not correctly installed in your system. Please install it before running SAGA algorithms." When I ran saga_cmd, I found: error: Library does not contain executable modules [librecreations_games.so] –  n1kn0k Mar 8 '13 at 11:56
    
did you compile it yourself or use a pre-compiled binary? On linux Sextante should be able to automatically determine your saga install folder, therefore there is a problem with your saga install. Download the latest src and compile it / install systemwide sourceforge.net/projects/saga-gis/files/SAGA%20-%202.0 –  Curlew Mar 8 '13 at 12:09
    
i used a package i found from the ubuntu Precise repos, version 2.07b –  n1kn0k Mar 8 '13 at 12:54
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