Thanks. I'll keep this in mind when I get to the point when I'm ready to
consider it as part of a program I'm writing. Someone in Image-SIG sent
me a module he wrote that might be helpful too.
Michael Droettboom wrote:
> Wayne Watson wrote:
>> I've used MPL a bit, and am wondering if there's a facility for
>> sending graphic images to a printer, or putting them in some format
>> like png? I don't necessarily want the graphics to appear in a
>> window, but would like to print them directly once they are ready.
>> Can one put in a page feed, so that images don't all fall on the same
>> page or cut across pages?
>>
> You can use one of the non-GUI backends to generate plots in a number
> of formats, including PNG, PDF, PS and SVG. See this:
>
> http://matplotlib.sourceforge.net/faq/installing_faq.html#backends
>
> The PDF backend is the only one I'm aware of that supports multiple
> pages. This is the docstring for PdfPages:
>
> A multi-page PDF file.
>
> Use like this::
>
> # Initialize:
> pp = PdfPages('foo.pdf')
>
> # As many times as you like, create a figure fig, then either:
> fig.savefig(pp, format='pdf') # note the format argument!
> # or:
> pp.savefig(fig)
>
> # Once you are done, remember to close the object:
> pp.close()
>
> (In reality PdfPages is a thin wrapper around PdfFile, in order to
> avoid confusion when using savefig and forgetting the format
> argument.)
>
>> Is there any image processing operation available to do simple
>> operations like dark subtract or stack different images on one other
>> to produce composites of several images? Maybe Python has such a
>> facility that's already available as a library?
>>
>>
> Matplotlib doesn't have a very strong set of these things built-in
> (though some things are possible with the image support in the image
> module). You can also get an rgb buffer of the figure (when using the
> Agg backend), eg. (where 'fig' is the figure object):
>
> fig.canvas.get_renderer().tostring_rgb()
>
> This is a string of 24-bit rgb triples, which can be converted to the
> Numpy array for arithmetical processing, or converted to a Python
> Imaging Library Image object.
>
> Mike
>
--
Wayne Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
"I was thinking about how people seem to read the Bible
a whole lot more as they get older; then it dawned on
me . . they're cramming for their final exam."
-- George Carlin
Web Page: <www.speckledwithstars.net/>
|
