matplotlib

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.html

But, it is only available in the svn version of matplotlib. For
example, you may do something like below

import matplotlib.pyplot as plt
from matplotlib.offsetbox import OffsetImage, AnnotationBbox

import numpy as np

if 1:
    ax = plt.subplot(111)

    xx = [0.22, 0.5, 0.83]
    yy = [0.5, 0.43, 0.63]

    ax.plot(xx, yy, "-")

    arr = np.arange(100).reshape((10,10))
    im = OffsetImage(arr, zoom=2)

    for x1, y1 in zip(xx, yy):
        ab = AnnotationBbox(im, (x1, y1),
                            xycoords='data',
                            frameon=False)

        ax.add_artist(ab)

-JJ


On Tue, Feb 23, 2010 at 9:07 AM, t putkonen <teeputkonen@...> wrote:
> 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.
>
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