Jeff,
Thanks for the report. I have committed a bugfix combined with a speedup: the
check for gray will not occur if the image is cached.
Eric
----- Original Message -----
From: Jeff Whitaker <[EMAIL PROTECTED]>
Date: Friday, June 2, 2006 1:07 pm
Subject: [matplotlib-devel] RGBA in imshow
To: matplotlib development list <matplotlib-devel@lists.sourceforge.net>
> Hi all:
>
> It looks like one can no longer plot an array of RGBA values in
> imshow -
> I suspect this is a consequence of the recent changes to the way
> colors
> are handled. For example
>
> from pylab import *
> # make a random rgba matrix
> rgba = ones((64,64,4),'f')
> for k in range(3):
> rgba[:,:,k] = rand(64,64).astype('f')
> imshow(rgba)
> show()
>
> works in 0.87.2, but fails with
>
> Traceback (most recent call last):
> File "/Users/jsw/lib/python/matplotlib/backends/backend_gtk.py",
> line
> 283, in expose_event
> self._render_figure(self._pixmap, w, h)
> File
> "/Users/jsw/lib/python/matplotlib/backends/backend_gtkagg.py",
> line 72, in _render_figure
> FigureCanvasAgg.draw(self)
> File "/Users/jsw/lib/python/matplotlib/backends/backend_agg.py",
> line
> 389, in draw
> self.figure.draw(renderer)
> File "/Users/jsw/lib/python/matplotlib/figure.py", line 531, in draw
> for a in self.axes: a.draw(renderer)
> File "/Users/jsw/lib/python/matplotlib/axes.py", line 991, in draw
> im.draw(renderer)
> File "/Users/jsw/lib/python/matplotlib/image.py", line 184, in draw
> im = self.make_image()
> File "/Users/jsw/lib/python/matplotlib/image.py", line 130, in
> make_image im.is_grayscale = (self.cmap.is_gray() and
> File "/Users/jsw/lib/python/matplotlib/colors.py", line 634, in
> is_gray return (alltrue(self._lut[:,0] == self._lut[:,1])
>
> with the latest svn.
>
> This patch to image.py seems to fix it, but I'm not sure it's the
> right
> solution
>
> --- /Users/jsw/lib/python/matplotlib/image.py.orig 2006-06-02
> 17:04:52.000000000 -0600
> +++ /Users/jsw/lib/python/matplotlib/image.py 2006-06-02
> 17:05:24.000000000 -0600
> @@ -127,8 +127,10 @@
> im.flipud_in()
>
> im.set_bg( *bg)
> - im.is_grayscale = (self.cmap.is_gray() and
> - len(self._A.shape) == 2)
> + if len(self._A.shape) == 2:
> + im.is_grayscale = self.cmap.is_gray()
> + else:
> + im.is_grayscale = False
>
> im.set_interpolation(self._interpd[self._interpolation])
>
>
> -Jeff
>
>
> --
> Jeffrey S. Whitaker Phone : (303)497-6313
> Meteorologist FAX : (303)497-6449
> NOAA/OAR/PSD R/PSD1 Email : [EMAIL PROTECTED]
> 325 Broadway Office : Skaggs Research Cntr 1D-124
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>
>
>
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