On Wed, Jul 21, 2010 at 3:40 PM, Jenna Lemonias <je...@astro.columbia.edu>wrote:
> I am trying to save a matplotlib 2d array image with an overlaid contour as
> an eps file. The contour appears to be shifted with respect to the image
> underneath in the eps file, particularly when I zoom in on the image. This
> shift is not noticeable in the plot within matplotlib.
>
> I am using imshow to display the image. The contour is created by plotting
> a list of closely-spaced x,y coordinates. The attached file matplotlib.png
> is a screenshot of the (zoomed-in) image as displayed by matplotlib. The
> attached file epsfile.png is a screenshot of the (zoomed-in) eps file. When
> I save this image as an eps file, it is actually 1 of 20 subplots and the
> shift is noticeable in each subplot.
>
> Thanks in advance for your help!
>
> Jenna
>
>
Just as a wild guess, could this actually be an issue with how imshow uses
the upper-left corner for (0,0)? I have seen 1-pixel shifts before, but
this shift is a little dramatic and I am left wondering if what we are
really seeing is that the contour that is desired should actually be fliped
in the y-axis?
Maybe you could try another example where you try to draw a contour further
away from the center of the image and see if it still goes in the spot you
expect it to be?
Ben Root
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