Re: [Matplotlib-users] transparent background for encapsulated postscript output

2007-12-17 Thread Alan G Isaac 
On Mon, 17 Dec 2007, Michael Droettboom apparently wrote:
> You can generate a PDF file with matplotlib, and then run 
> it through "acroread -toPostScript foo.pdf", and get 
> a reasonably well-optimized Postscript file. 

I did not know that.

Thanks!
Alan




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Re: [Matplotlib-users] transparent background for encapsulated postscript output

2007-12-17 Thread Michael Droettboom 
Well, I hate to provide the disappointing answer, but it really doesn't 
work for Postscript.  (The name pstricks has perhaps become misleading 
over time...)

It inserts special codes in the Postscript that aren't part of the Ps 
standard, but that ps2pdf14 is able to convert into the correct Pdf 
commands to handle alpha-blending.  I don't see any advantage to that 
kind of workflow (with matplotlib) over just going directly to PDF.

There are other tricks to "fake" transparency in Postscript, for 
example, by calculating the polygon intersections, etc., but that is 
significant work, and hard to do in a general way (i.e. anything 
overlapping anything), without writing a full-fledged geometry framework.

Fortunately, Adobe Reader already has such a thing.  You can generate a 
PDF file with matplotlib, and then run it through "acroread 
-toPostScript foo.pdf", and get a reasonably well-optimized Postscript 
file.  Unfortunately, ghostscript 7.07 doesn't seem to do this -- it can 
convert a pdf to a ps file, but the alphablended stuff appears as a 
raster image.  Maybe newer versions (or poppler etc.) are able to do 
this, but I don't have them on my machine.  It would be nice to know of 
an open source alternative, but Adobe Reader is at least free-as-in-beer.

Cheers,
Mike

Alan G Isaac wrote:
> On Mon, 17 Dec 2007, Tom Johnson apparently wrote:
>> pstricks (tex) provides transparency... 
>> http://tug.org/PSTricks/main.cgi?file=Examples/Colors/colors#transparency 
>> http://tug.org/PSTricks/main.cgi?file=pst-plot/3D/examples#coor 
> 
> 
> Impressive.  How is it done?
> 
> Cheers,
> Alan Isaac
> 
> 
> 
> 
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Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

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Re: [Matplotlib-users] transparent background for encapsulated postscript output

2007-12-17 Thread Alan G Isaac 
On Mon, 17 Dec 2007, Tom Johnson apparently wrote:
> pstricks (tex) provides transparency... 
> http://tug.org/PSTricks/main.cgi?file=Examples/Colors/colors#transparency 
> http://tug.org/PSTricks/main.cgi?file=pst-plot/3D/examples#coor 


Impressive.  How is it done?

Cheers,
Alan Isaac




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Re: [Matplotlib-users] transparent background for encapsulated postscript output

2007-12-17 Thread Tom Johnson 
On Dec 14, 2007 11:28 AM, Jeff Whitaker <[EMAIL PROTECTED]> wrote:
> Mike:  Postscript doesn't support alpha transparency.  It might work
> with PDF though.

pstricks (tex) provides transparency...

http://tug.org/PSTricks/main.cgi?file=Examples/Colors/colors#transparency
http://tug.org/PSTricks/main.cgi?file=pst-plot/3D/examples#coor


Is there any way to get similar hacks into matplotlib?  I'm guessing
this is a lot of work though.

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Re: [Matplotlib-users] transparent background for encapsulated postscript output

2007-12-14 Thread Jeff Whitaker 
Michael Hearne wrote:
> Jeff - Yes!  I'm working on implementing this now for my app...
>
> FYI, I got the following error:
> TypeError: drawmapboundary() got an unexpected keyword argument 
> 'fill_color'
>
>
> and again for 'lake_color' on the fillcontinents() method.
>
> I'm using 0.9.7, which I think is the latest released version...

Mike:  Those are new keywords in 0.9.8 (released a few weeks ago).

-Jeff
>
> --Mike
> On Dec 14, 2007, at 1:31 PM, Jeff Whitaker wrote:
>
>> from matplotlib.toolkits.basemap import Basemap
>>
>> import pylab
>>
>> fig = pylab.figure()
>>
>> ax1 = fig.add_axes([0.1,0.1,0.8,0.8])
>>
>> m = Basemap(ax=ax1)
>>
>> m.drawcoastlines(linewidth=0.5)
>>
>> m.fillcontinents()
>>
>> ax2 = fig.add_axes([0.1,0.425,0.15,0.15])
>>
>> m2 = Basemap(projection='ortho',lon_0=-105,lat_0=40,ax=ax2)
>>
>> m2.drawmapboundary(fill_color='aqua')
>>
>> m2.drawcoastlines(linewidth=0.1)
>>
>> m2.fillcontinents(color='coral',lake_color='aqua')
>>
>> pylab.show()
>>
>
>
>
>
> --
> Michael Hearne
> [EMAIL PROTECTED] 
> (303) 273-8620
> USGS National Earthquake Information Center
> 1711 Illinois St. Golden CO 80401
> Senior Software Engineer
> Synergetics, Inc.
> --
>
>


-- 
Jeffrey S. Whitaker Phone  : (303)497-6313
Meteorologist   FAX: (303)497-6449
NOAA/OAR/PSD  R/PSD1Email  : [EMAIL PROTECTED]
325 BroadwayOffice : Skaggs Research Cntr 1D-124
Boulder, CO, USA 80303-3328 Web: http://tinyurl.com/5telg


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Re: [Matplotlib-users] transparent background for encapsulated postscript output

2007-12-14 Thread Michael Hearne 

Jeff - Yes!  I'm working on implementing this now for my app...

FYI, I got the following error:
TypeError: drawmapboundary() got an unexpected keyword argument  
'fill_color'



and again for 'lake_color' on the fillcontinents() method.

I'm using 0.9.7, which I think is the latest released version...

--Mike
On Dec 14, 2007, at 1:31 PM, Jeff Whitaker wrote:


from matplotlib.toolkits.basemap import Basemap
import pylab
fig = pylab.figure()
ax1 = fig.add_axes([0.1,0.1,0.8,0.8])
m = Basemap(ax=ax1)
m.drawcoastlines(linewidth=0.5)
m.fillcontinents()
ax2 = fig.add_axes([0.1,0.425,0.15,0.15])
m2 = Basemap(projection='ortho',lon_0=-105,lat_0=40,ax=ax2)
m2.drawmapboundary(fill_color='aqua')
m2.drawcoastlines(linewidth=0.1)
m2.fillcontinents(color='coral',lake_color='aqua')
pylab.show()





--
Michael Hearne
[EMAIL PROTECTED]
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USGS National Earthquake Information Center
1711 Illinois St. Golden CO 80401
Senior Software Engineer
Synergetics, Inc.
--


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Re: [Matplotlib-users] transparent background for encapsulated postscript output

2007-12-14 Thread Michael Hearne 

Jeff - Yes, that's what I want, thanks.

I think more explanation is in order - my large-scale map is the  
default basemap projection.  The inset map of the globe is a  
orthogonal projection, which means it comes out as a little circle.   
I want to insert this smaller map into the larger one, without having  
to see the area around the circle.


I'm having trouble explaining this... here's an example:
http://earthquake.usgs.gov/eqcenter/pager/us/2007kwau/us/1/onePAGER.pdf

I want to replicate the little inset globe on the map with the contours.

--Mike

On Dec 14, 2007, at 12:49 PM, Jeff Whitaker wrote:


Michael Hearne wrote:
Jeff - Darn it.  So is there a way to embed an axis _inside_  
another, possibly with a transparent background?


--Mike



Mike:  Not quite sure why you need to have it transparent - you  
definitely can't have that with postscript, but it should be  
possible with the other backends (png, pdf or svg).  There's an  
example of embedded axes at http://matplotlib.sourceforge.net/ 
screenshots.html (axes_demo.py).  The inset axes is just drawn on  
top of the primary axes in the same figure. Is that what you want?


-Jeff


On Dec 14, 2007, at 12:28 PM, Jeff Whitaker wrote:


Michael Hearne wrote:

I am using Basemap, and trying to create two maps:

One large-scale map, and a small-scale inset map of the world  
centered on the location of the large-scale map.  My ultimate  
goal is to create a figure where the inset map is inserted into  
a corner of the large-scale map.  I can see two ways of doing this:


1) Create both as encapsulated postscript images separately, and  
put them together in a later "compositing" process. (I'm doing  
this already).
2) Create both as basemap instances, and then draw the smaller  
one on top of the large-scale one.  I have no idea how to do this.


A problem I have encountered with the first method is that my  
image background is set to white by default.  I've tried to make  
it transparent by doing the following:


fig = figure(figsize=(5,5),frameon=False) #turn the frame off  
completely
fig.figurePatch.set_alpha(0.0) #tried setting this to 1.0 and  
0.0, neither works


Method #2 would be cleaner, if I could do what I wanted to do in  
terms of transparencies, but if not, I'll take method #1.


Does anyone know if it is possible to set the image background  
transparent for encapsulated postscript output?


Thanks,

Mike


Mike:  Postscript doesn't support alpha transparency.  It might  
work with PDF though.


-Jeff

--
Jeffrey S. Whitaker Phone  : (303)497-6313
Meteorologist   FAX: (303)497-6449
NOAA/OAR/PSD  R/PSD1Email  : [EMAIL PROTECTED]  


325 BroadwayOffice : Skaggs Research Cntr 1D-124
Boulder, CO, USA 80303-3328 Web: http://tinyurl.com/5telg





--
Michael Hearne
[EMAIL PROTECTED] 
(303) 273-8620
USGS National Earthquake Information Center
1711 Illinois St. Golden CO 80401
Senior Software Engineer
Synergetics, Inc.
--





--
Jeffrey S. Whitaker Phone  : (303)497-6313
Meteorologist   FAX: (303)497-6449
NOAA/OAR/PSD  R/PSD1Email  : [EMAIL PROTECTED]
325 BroadwayOffice : Skaggs Research Cntr 1D-124
Boulder, CO, USA 80303-3328 Web: http://tinyurl.com/5telg





--
Michael Hearne
[EMAIL PROTECTED]
(303) 273-8620
USGS National Earthquake Information Center
1711 Illinois St. Golden CO 80401
Senior Software Engineer
Synergetics, Inc.
--


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Re: [Matplotlib-users] transparent background for encapsulated postscript output

2007-12-14 Thread Jeff Whitaker 
Michael Hearne wrote:
> Jeff - Darn it.  So is there a way to embed an axis _inside_ another, 
> possibly with a transparent background?
>
> --Mike


Mike:  Not quite sure why you need to have it transparent - you 
definitely can't have that with postscript, but it should be possible 
with the other backends (png, pdf or svg).  There's an example of 
embedded axes at http://matplotlib.sourceforge.net/screenshots.html 
(axes_demo.py).  The inset axes is just drawn on top of the primary axes 
in the same figure. Is that what you want?

-Jeff

> On Dec 14, 2007, at 12:28 PM, Jeff Whitaker wrote:
>
>> Michael Hearne wrote:
>>> I am using Basemap, and trying to create two maps:
>>>
>>> One large-scale map, and a small-scale inset map of the world 
>>> centered on the location of the large-scale map.  My ultimate goal 
>>> is to create a figure where the inset map is inserted into a corner 
>>> of the large-scale map.  I can see two ways of doing this:
>>>
>>> 1) Create both as encapsulated postscript images separately, and put 
>>> them together in a later "compositing" process. (I'm doing this 
>>> already).
>>> 2) Create both as basemap instances, and then draw the smaller one 
>>> on top of the large-scale one.  I have no idea how to do this.
>>>
>>> A problem I have encountered with the first method is that my image 
>>> background is set to white by default.  I've tried to make it 
>>> transparent by doing the following:
>>>
>>> fig = figure(figsize=(5,5),frameon=False) #turn the frame off completely
>>> fig.figurePatch.set_alpha(0.0) #tried setting this to 1.0 and 0.0, 
>>> neither works
>>>
>>> Method #2 would be cleaner, if I could do what I wanted to do in 
>>> terms of transparencies, but if not, I'll take method #1.
>>>
>>> Does anyone know if it is possible to set the image background 
>>> transparent for encapsulated postscript output?
>>>
>>> Thanks,
>>>
>>> Mike 
>>>
>>
>> Mike:  Postscript doesn't support alpha transparency.  It might work 
>> with PDF though.
>>
>> -Jeff
>>
>> -- 
>> Jeffrey S. Whitaker Phone  : (303)497-6313
>> Meteorologist   FAX: (303)497-6449
>> NOAA/OAR/PSD  R/PSD1Email  : [EMAIL PROTECTED] 
>> 
>> 325 BroadwayOffice : Skaggs Research Cntr 1D-124
>> Boulder, CO, USA 80303-3328 Web: http://tinyurl.com/5telg
>
>
>
>
> --
> Michael Hearne
> [EMAIL PROTECTED] 
> (303) 273-8620
> USGS National Earthquake Information Center
> 1711 Illinois St. Golden CO 80401
> Senior Software Engineer
> Synergetics, Inc.
> --
>
>


-- 
Jeffrey S. Whitaker Phone  : (303)497-6313
Meteorologist   FAX: (303)497-6449
NOAA/OAR/PSD  R/PSD1Email  : [EMAIL PROTECTED]
325 BroadwayOffice : Skaggs Research Cntr 1D-124
Boulder, CO, USA 80303-3328 Web: http://tinyurl.com/5telg


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Re: [Matplotlib-users] transparent background for encapsulated postscript output

2007-12-14 Thread Jeff Whitaker 
Michael Hearne wrote:
> I am using Basemap, and trying to create two maps:
>
> One large-scale map, and a small-scale inset map of the world centered 
> on the location of the large-scale map.  My ultimate goal is to create 
> a figure where the inset map is inserted into a corner of the 
> large-scale map.  I can see two ways of doing this:
>
> 1) Create both as encapsulated postscript images separately, and put 
> them together in a later "compositing" process. (I'm doing this already).
> 2) Create both as basemap instances, and then draw the smaller one on 
> top of the large-scale one.  I have no idea how to do this.
>
> A problem I have encountered with the first method is that my image 
> background is set to white by default.  I've tried to make it 
> transparent by doing the following:
>
> fig = figure(figsize=(5,5),frameon=False) #turn the frame off completely
> fig.figurePatch.set_alpha(0.0) #tried setting this to 1.0 and 0.0, 
> neither works
>
> Method #2 would be cleaner, if I could do what I wanted to do in terms 
> of transparencies, but if not, I'll take method #1.
>
> Does anyone know if it is possible to set the image background 
> transparent for encapsulated postscript output?
>
> Thanks,
>
> Mike 
>
>

Mike:  Postscript doesn't support alpha transparency.  It might work 
with PDF though.

-Jeff

-- 
Jeffrey S. Whitaker Phone  : (303)497-6313
Meteorologist   FAX: (303)497-6449
NOAA/OAR/PSD  R/PSD1Email  : [EMAIL PROTECTED]
325 BroadwayOffice : Skaggs Research Cntr 1D-124
Boulder, CO, USA 80303-3328 Web: http://tinyurl.com/5telg


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[Matplotlib-users] transparent background for encapsulated postscript output

2007-12-14 Thread Michael Hearne 

I am using Basemap, and trying to create two maps:

One large-scale map, and a small-scale inset map of the world  
centered on the location of the large-scale map.  My ultimate goal is  
to create a figure where the inset map is inserted into a corner of  
the large-scale map.  I can see two ways of doing this:


1) Create both as encapsulated postscript images separately, and put  
them together in a later "compositing" process. (I'm doing this  
already).
2) Create both as basemap instances, and then draw the smaller one on  
top of the large-scale one.  I have no idea how to do this.


A problem I have encountered with the first method is that my image  
background is set to white by default.  I've tried to make it  
transparent by doing the following:


fig = figure(figsize=(5,5),frameon=False) #turn the frame off completely
fig.figurePatch.set_alpha(0.0) #tried setting this to 1.0 and 0.0,  
neither works


Method #2 would be cleaner, if I could do what I wanted to do in  
terms of transparencies, but if not, I'll take method #1.


Does anyone know if it is possible to set the image background  
transparent for encapsulated postscript output?


Thanks,

Mike




--
Michael Hearne
[EMAIL PROTECTED]
(303) 273-8620
USGS National Earthquake Information Center
1711 Illinois St. Golden CO 80401
Senior Software Engineer
Synergetics, Inc.
--


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