On Thu, Jul 26, 2012 at 1:40 PM, Paolo Cavallini <cavall...@faunalia.it> wrote: > Il 26/07/2012 21:29, Etienne Tourigny ha scritto: >> Is there anything in the vector color ramps that should NOT be >> available for raster color ramps? > Beware that many ramps have a meaning only when applied to absolute > values (e.g. DTM), not on a relative (0-100%) scale. This is true for > both, probably more often for rasters. > All the best.
Concerning color ramps, it reminds me of an article I read about thematic maps and cross-tinting by Tom Patterson (creator of Natural Earth) [0]. While his technique uses Photoshop, it brings up two interesting questions: Is blending two color ramps (maybe from different data sources) possible on-the-fly in QGIS? And, is it possible to set a blending mode for a layer? Qt supports blending modes in its painting engine [1], but I only see alpha blending (transparency) supported. Example of needed use: create hillshaded or thematic raster (overlay) from DEM, import above other background layers, set overlay layer to blend mode in layer properties (e.g. multiply for hillshade). [0] http://www.shadedrelief.com/hypso/hypso.html [1] http://doc.qt.nokia.com/4.7-snapshot/painting-imagecomposition.html Regards, Larry Shaffer Dakota Cartography Black Hills, South Dakota _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
