There is a pull request for this here:
https://github.com/matplotlib/matplotlib/pull/695
If you're able to checkout and build that branch from git, I would
appreciate hearing if it resolves your issue.
Mike
On 02/06/2012 12:58 PM, Chris wrote:
JJ,
Thanks for the clarification. Now I understand why EPS outputs of
pixel plot from mpl is a few times bigger than those from SuperMongo.
I guess that mpl uses the square implementation for pixel so that it
would use the same method to handle all marker types. I will file an
issue report on git. Meanwhile, is there any easy workaround?
Jonathan,
Tom Robitaille's module does help reducing file size of postscript,
but by rasterize a scalable plot. It doesn't really help my problem
since the markers are still drawn with the same method as other
plotting methods.
Bests,
Chris
On Mon, Feb 6, 2012 at 4:28 AM, Jae-Joon Lee<lee.j.j...@gmail.com> wrote:
Thanks. Now I understand the situation.
As far as I can see, marker="," is implemented as a rectangle path
with width/height of 1 pixel, so this result in 2x2 pixel filled
square.
I tried to change the size of the rectangle, etc, to get a single
pixel filled square, but did not get a satisfactory result.
I think we need an Agg expert. I hope Mike or others take a look.
Chris,
if you do not get a response from others in this mailing list, I
recommend you to open a new issue in our github page.
Regards,
-JJ
On Mon, Feb 6, 2012 at 6:19 AM, Jonathan Slavin<jsla...@cfa.harvard.edu> wrote:
Chris,
You might want to try a module written by Tom Robitaille (aka astrofrog)
called rasterized_scatter. Look for it on github.
Jon
On Mon, 2012-02-06 at 21:28 +0900, Jae-Joon Lee wrote:
Thanks. Now I understand the situation.
As far as I can see, marker="," is implemented as a rectangle path
with width/height of 1 pixel, so this result in 2x2 pixel filled
square.
I tried to change the size of the rectangle, etc, to get a single
pixel filled square, but did not get a satisfactory result.
I think we need an Agg expert. I hope Mike or others take a look.
Chris,
if you do not get a response from others in this mailing list, I
recommend you to open a new issue in our github page.
Regards,
-JJ
On Mon, Feb 6, 2012 at 1:53 AM, Chris<plut...@gmail.com> wrote:
Thanks JJ.
The problem seems not to be a size issue -- markersize has no effect
when use marker="," (pixel). I have also tried to turn off aa, and it
doesn't help either. I also tried different backends. The PNG output
from Agg and Cairo is slightly different: Agg's point has 4 solid
pixel, while Cairo's has 4 pixel with random shade.
Postscript output has the same problem. The "pixel" in an EPS file
generated by mpl is significantly bigger than that from another
drawing program I used.
The problem occurs in all my plotting scripts, e.g., this basic one:
[CODE]
import numpy as np
x=np.arange(100)
y=np.random.randn(100)
ioff()
fig=gcf()
fig.clf()
ax=fig.add_axes(0.15,0.1,0.8, 0.85)
ax.plot(x,y,"k,")
ion()
fig.canvas.draw()
[/CODE]
Here is how I identify the problem:
1. use the above script to plot on screen
2. savefig("plot.png")
3. open plot.png in GIMP and check the pixel size.
I also attached the two PNG files generated with Agg and Cairo backends.
On Sun, Feb 5, 2012 at 6:45 AM, Jae-Joon Lee<lee.j.j...@gmail.com> wrote:
How are you plotting your points.
If you use *plot*, there is a *markersize* parameter.
If you use *scatter*, the third argument controls the marker size.
But you may actually complaining about other issues, e.g.,
antialiasing, etc. So, if above are not your answer, please post a
complete example and describe your problem in more detail.
Regards,
-JJ
On Sat, Feb 4, 2012 at 2:15 PM, Chris<plut...@gmail.com> wrote:
I noticed this a few years back, but left it aside because most of the
time I can live with it. Recently I need to make a few plots
containing a few million points, and 4 pixels for a point is a
disaster. So my question is why the pixel marker size is set at 4
pixels? And is there anyway to change it to a single pixel?
Thanks,
Chris
------------------------------------------------------------------------------
Try before you buy = See our experts in action!
The most comprehensive online learning library for Microsoft developers
is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3,
Metro Style Apps, more. Free future releases when you subscribe now!
http://p.sf.net/sfu/learndevnow-dev2
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users
------------------------------------------------------------------------------
Try before you buy = See our experts in action!
The most comprehensive online learning library for Microsoft developers
is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3,
Metro Style Apps, more. Free future releases when you subscribe now!
http://p.sf.net/sfu/learndevnow-dev2
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users
