This is a long-standing bug in matplotlib (discussed here: http://sourceforge.net/mailarchive/forum.php?thread_name=4D2DF596.3060503%40hawaii.edu&forum_name=matplotlib-users)

It may be a bit of work on your part to make a simple script that reproduces the bug, but I think it would be worthwhile to report this on matplotlib-users and so that we can get an official response from the matplotlib developers.

I did and bit of googling but unfortunately I can't find a simple fix for this beyond Sam's suggestion to do the conversion to vector graphics by hand.

Cheers,

Nathan Goldbaum
Graduate Student
Astronomy & Astrophysics, UCSC
goldbaum@ucolick.org
http://www.ucolick.org/~goldbaum

On Jun 27, 2012, at 2:17 PM, Sam Skillman wrote:

Hi Christine,

This doesn't fix the underlying issue, but I usually just dump the pngs out with a high dpi and use a conversion from png to eps.  If you have Gimp, you may want to give this a shot:
http://code.google.com/p/agpy/source/browse/trunk/contributed/pngtoeps?r=247

Others might have better ideas, but my guess is a lot of them will deal with modifying your matplotlib backend, which I've never had great luck with for vector formats.

Best,
Sam

On Wed, Jun 27, 2012 at 3:10 PM, Christine Simpson <csimpson@astro.columbia.edu> wrote:
Hi everyone,

I have a question that may be more of a matplotlib question than a yt
question, but it's an issue with some yt generated figures I have, so I
thought I'd ask it here.  I think there was some discussion of this on
the list a while ago but I can't find the thread.

When I output images that include colorbars in vector formats (like pdf
and eps), I get these little lines running across the color bar.  It
goes away if I output the image in a rasterized format (like png).  I
wanted to output my images in vector format (as pdfs) so everything
looks nice and sharp.  I've figured out how to just rasterize the color
bar.  However, I don't want to rasterize the color bar labels, and the
way I've implemented it, the labels get rasterized too.  It seems in
figure objects (and maybe axes objects?) there is a way to specify the
order that items get drawn and/or rasterized (through the zorder and
rasterized_zorder keywords); I've played around with this but haven't
been able to get it to work.  The color bar is a Colorbar object and it
doesn't seem like this class allows for adjusting the rasterization
order of things.

I've pasted an example script here:
http://paste.yt-project.org/show/2504/
I'm probably going to give up on this soon, but any advice people have
would be greatly appreciated.

Christine


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