> [had to delete an endless amount of stuff not related to matplotlib]
matplotlib is _not_ a dedicated image manipulation package, so please
don't blame it that you don't manage to easily use it as such one.
However, matplotlib indeed offers high quality image scaling abilities
(at the moment not for downscaling) due to the use of Agg.
If you want a simpler solution, try this:
import wx
img = wx.Image('your image.jpg')
scale = 2
img.Rescale(img.Width * scale, img.Height * scale, wx.IMAGE_QUALITY_HIGH)
img.SaveFile('your scaled image.jpg')
Gregor
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