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I think you're missing something in what johns has said in his comment. When you are looking at the symbology for the raster there are two renderers to choose from - stretched and RGB composite. However, on the RGB composite settings there is also a stretch option. You need to set this to None. There are a couple of ways to export a raster. If using the ...


You can save the original layer file then add the exported tiff to map and import the saved layer file symbology in the raster Layer Properties -> Symbology tab. If the original raster is still in the map document you can also select it from the drop-down menu.


This problem may arise if the source file has paletted colours. During reprojection, QGIS tries to interpolate between original cell values, and this fails when you only have a bunch of paletted colours. So expand your raster file to RGB, which allws for contiguos interpolating. Raster -> Convert -> Translate has a dropdown box that you can change ...


Most GIS desktop software apps have ability to plot table or csv data based on lng/lat or x/y values to generate a point event layer. Event layers may then be exported to a GIS layer (e.g. shapefile), and then you may run a spatial analysis interpolation tool or script to create the raster surface similar to your link example. Finally, these raster layers ...

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