markers are vector paths, so I don't think you can use images as markers.
But you may overlay your images using imshow. The tricky part is to
figure out the extents of the image.
You may use OffsetImage
http://matplotlib.sourceforge.net/trunk-docs/examples/pylab_examples/demo_annotation_box.ht
I would like to use custom symbols (markers) on both line charts and scatter
charts. The symbols I would like to use are currently stored in PNG files.
Is there a way to convert these images to markers? Symbols are pretty simple
and contain only one colour, and the background should be transparent.
