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Plotting on top of an image without actually showing either

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Simon
Simon 2014-3-2
Hi guys Basically, I want to show an image, plot something on top that image, and then save this over-plotted image. However, I want to do all this without ever actually showing the image to the user.
I realise I could directly modify the pixels in the image file but this is laborious and slow, and I don't have access to the plotting tools. Is there a better way of doing this?

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