I'm looking for a way to consistently display raster images or PDFs, so that the image on screen has a calibrated physical size. I.e. I create an image/PDF on a computer with a shape 10cm*10cm and want it to be exactly this size on the tablet's screen. I don't care if I have to measure/calibrate something beforehand, or if the viewer on the device queries e.g. the screen size/ppi and image dpi to do this. I only need this to be accurate for one single device. Any ideas on how to do this?