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Android: transforming images and interpolation algorithm

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http://stackoverflow.com – I am currently placing images over each other by drawing them on a canvas using a matrix. The problem is: after rotating and scaling I end up with dirty/rough edges. Looks like this: http://i.stack.imgur.com/5pPQJ.png The problem is NOT that the image is low resolution, my theory is that it is related to the interpolation algorithm of the drawing engine in android. Can anyone give me some advice here? (HowTos)