[Qgis-user] to query a raster

[iomeneandrei]

Dear all,
I would like to highlight all the pixels of a DEM with a value exceeding a
specific height value. Something like "SELECT * FROM dem WHERE zvalue >
150".

Is there a way to do this in QGIS? 
Is grass plugin the only tool I can use inside QGIS to make this kind of
query?
Is there a way to have only something that highlights the pixels and do not
produce a new layer?

Thank you,

Andrea

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Andrea Borruso

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