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
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