I have just realised I have been under the wrong impression about the whole mdpi/hdpi/xhdpi issue. I had the idea that on a big 10 inch tablet, the OS will naturally use the image in the xhdpi directory and on a small phone the OS will select the one in the mdpi directory... but after some experimentation I've realised that the different directories are for different pixels per inch and independent of the the actual total number of pixels. But this is a real problem, because now I am having trouble arranging to have the largest images being used for the largest absolute number of pixels. Can this be done without stretching/shrinking the bitmaps?