Re: [Matplotlib-users] imshow size limitations?

[David G. <d_l...@ya...>]

Oh, forgot to mention: same code works fine on a smaller (fewer pixels) image.

DG

--- On Sat, 9/6/08, David Goldsmith <d_l...@ya...> wrote:

> From: David Goldsmith <d_l...@ya...>
> Subject: [Matplotlib-users] imshow size limitations?
> To: mat...@li...
> Date: Saturday, September 6, 2008, 10:46 AM
> Hi!  I'm trying to display a 10800 x 8100 pixel image w/
> imshow using the following code (adapted from a response to
> a previous post of mine):
> 
> from matplotlib.backends.backend_agg import FigureCanvasAgg
> as FigureCanvas
> from matplotlib.figure import Figure
> 
> fig = Figure(figsize=(36,27), 
>              dpi=300, 
>              frameon=False)
> canvas = FigureCanvas(fig)
> ax = fig.add_subplot(111, xticks=[], yticks=[])
> cmap = MPL.cm.get_cmap('prism_r')
> ax.imshow(result, cmap=cmap)
> canvas.print_figure('HiResHex')
> 
> I get the following error report:
> 
> Traceback (most recent call last):
>   File "Hex.py", line 208, in <module>
>     canvas.print_figure('HiResHex')
>   File
> "C:\python25\lib\site-packages\matplotlib\backend_bases.py",
> line 1201, i
> n print_figure
>     self.figure.canvas.draw()
>   File
> "C:\python25\lib\site-packages\matplotlib\backends\backend_agg.py",
> line
> 358, in draw
>     self.figure.draw(self.renderer)
>   File
> "C:\python25\lib\site-packages\matplotlib\figure.py",
> line 624, in draw
>     for a in self.axes: a.draw(renderer)
>   File
> "C:\python25\lib\site-packages\matplotlib\axes.py",
> line 1305, in draw
>     for im in self.images if im.get_visible()]
>   File
> "C:\python25\lib\site-packages\matplotlib\image.py",
> line 131, in make_im
> age
>     x = self.to_rgba(self._A, self._alpha)
>   File
> "C:\python25\lib\site-packages\matplotlib\cm.py",
> line 75, in to_rgba
>     x = self.norm(x)
>   File
> "C:\python25\lib\site-packages\matplotlib\colors.py",
> line 593, in __call
> __
>     val = ma.asarray(value).astype(npy.float)
>   File
> "C:\python25\lib\site-packages\numpy\core\ma.py",
> line 1151, in astype
>     d = self._data.astype(tc)
> MemoryError
> 
> Is there some maximum number of pixels imshow can handle? 
> Any other suggestions?
> 
> Platform Details: MPL 0.91.2 (sorry, I didn't realize I
> was running such an old version, maybe I just need to
> upgrade?), Python 2.5.2, Windows XP 2002 SP3, 504MB physical
> RAM, 1294MB VM Page size (1000MB init., 5000MB max)
> 
> Thanks!
> 
> DG
> 
> 
>       
> 
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