Markus,
Looking again at your image, I realized that you are probably using real
data, not simulated data, therefore you can't easily use a higher grid
resolution.
So, I created a test script to examine this. I have found that there is
definitely a difference between filetypes. In my test script, there is a
white row that occurs for pcolor, but not for pcolormesh (Note, I have a
patched version of matplotlib that rasterizes pcolormesh). Also, this
effect does not happen if rasterization is set to False. Lastly, the effect
is more pronounced with lower-resolution data.
Let me clean up the test script so that the devels to use to visualize this
issue.
Ben Root
On Fri, May 21, 2010 at 9:45 AM, Markus Haider <markus.hai...@uibk.ac.at>wrote:
> Hi,
>
> Thank you for your reply.
>
> > I have been doing some testing with pcolor() and pcolormesh() with
> > regards to rasterization. I can not see a displacement when choosing
> > between different file types or with setting rasterized to be True or
> > False. What I have noticed is a half grid-space displacement between
> > pcolor() and pcolormesh().
>
> Can you see the displacement in the before enclosed pdf file?
>
> > You can see if this is the cause of your displacement by choosing a
> > higher resolution grid. In such a case, the displacement should be
> > smaller.
>
> How can I choose a higher resolution grid?
> Thank you for your help,
> Greetings,
> Markus
>
> > Ben Root
> >
> > On Fri, May 21, 2010 at 5:03 AM, Markus Haider
> > <markus.hai...@uibk.ac.at> wrote:
> > Hello,
> >
> > I make colormap plots in matplotlib using pcolor or
> > pcolormesh. With
> > both I have a problem:
> >
> > If I use pcolormesh ("p2 =
> > ax2.pcolormesh(10**temp,rasterized=True)") I
> > get perfectly small file sizes, but the position of the
> > rasterized
> > colormap is a little bit displaced with respect to the frame,
> > showing a
> > white border on the top and right side. Is this a bug, or can
> > I change
> > this?
> >
> > If I try with pcolor, I get the
> > message/usr/lib/pymodules/python2.6/matplotlib/artist.py:562:
> > UserWarning: Rasterization of
> > '<matplotlib.collections.PolyCollection
> > object at 0x2aac890>' will be ignored
> > warnings.warn("Rasterization of '%s' will be ignored" % self)
> >
> >
> > Thank you very much for your help,
> > Markus
> >
> >
> ------------------------------------------------------------------------------
> >
> >
> > _______________________________________________
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> > Matplotlib-devel@lists.sourceforge.net
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> >
> >
>
>
>
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