Actually, I should clarify something. The way imread is set up, since
the file is a PNG, it never goes through pil_to_array at all in
standard imread and instead gets passed to the handler _png.read_png.
Anyway, I'll take a closer peek inside the _png.cpp file once I get
some more time.
Josh
On Thu, Oct 23, 2008 at 3:51 PM, Joshua Lippai <[EMAIL PROTECTED]> wrote:
> David,
>
> After playing around with this file and the various elements of
> image.py, I've determined that the pil_to_array function in
> matplotlib.image works just fine, so the place where the problem is
> introduced in imread is the read_png function in matplotlib._png. So a
> simpler work-around for this file than reading each bit into a bool
> array yourself would be to import Image (PIL) and matplotlib.image to
> call the pil_to_array function on an Image.open'd object directly:
>
> import Image
> import matplotlib.image as image
> import pylab as p
> x = image.pil_to_array(Image.open('bin.png')); p.imshow(x); p.show()
>
>
> In the mean time, I'll see if the devel list has some better insight
> on the issue.
>
> Josh
>
> On Thu, Oct 23, 2008 at 1:52 PM, David Warde-Farley <[EMAIL PROTECTED]> wrote:
>>
>> On 23-Oct-08, at 4:43 PM, David Warde-Farley wrote:
>>
>>> Sure; see http://morrislab.med.utoronto.ca/~dwf/bin.png
>>>
>>> In [12]: x = imread('bin.png'); imshow(x)
>>>
>>> produces a colourful plot that bears no resemblance to the original.
>>
>>
>> Two other things:
>>
>> a) PIL can read in these without incident; my work around has been to
>> open with PIL and manually read each bit into a dtype=bool numpy array.
>>
>> b) I might add that what appears seems to be cyclic, making me think
>> that it's trying to read a few bytes for each pixel where in fact
>> there is only a single bit, and thus reading far less data than it's
>> expecting, and thus only has a few columns worth of pixels that is
>> somehow getting repeatedly referenced in the numpy array. This is all
>> just (mildly educated) guesswork though.
>>
>> David
>>
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