With PyQGIS, look at How to extract X Y coordinates and RGB from pixels using python in QGIS? <http://gis.stackexchange.com/a/90719> or PyQGIS (QGIS 2): geological cross-sections (colorization of a topographic profile build from a DEM with the colors of a raster and placement of the intersection points of the geological layers boundaries ) <http://www.portailsig.org/content/pyqgis-qgis-2-les-coupes-geologiques-colorisation-d-un-profil-topographique-elabore-partir-d> (in French)
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