I was wondering how to check the value of a pixel at a mouse click in QGIS (as of 2.4).
In ArcGIS, the Identify tool does the job for both rasters and vectors. However, in QGIS, the Identify tool seems to be greyed out when only one raster layer is loaded.
Answer
In QGIS v.2.6.1, I can effectively use the Identify tool to get values from each raster band on a mouse click.
Additionally (and if you are using other QGIS versions), you could use the Value Tool plugin, which displays raster band values (and even a graph) on mouse movement.
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