[yt-users] colorbar rasterization

[Christine Simpson]

In the beginning I did just what Sam suggested and it didn't look that
great, but maybe I need to up the dpi more.  The one tricky thing I
found in converting the png's to pdf's by hand was getting the colors to
come out right.  I used ImageMagick and had to specify the -type flag to
get it to come out right.

I will try emailing the matplotlib users list.  Silly question: how do I
determine the version number of matplotlib in my yt installation?

Christine

On Wed, 2012-06-27 at 14:28 -0700, Nathan Goldbaum wrote:
> 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 at 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 at 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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> > 
> > 
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