Howdy,
I noticed that MPL's imread() command, when applied to binary (1-bit
grayscale) PNGs does some serious mangling.
Anyone know what's going on, or is it just that only RGBA PNG's are
supported?
Thanks,
David
-
Thi
I'm not aware of that problem. It should convert any PNG implicitly to
our native RGBA format. Can you provide a PNG file that illustrates the
breakage?
Mike
David Warde-Farley wrote:
> Howdy,
>
> I noticed that MPL's imread() command, when applied to binary (1-bit
> grayscale) PNGs does so
On 23-Oct-08, at 8:50 AM, Michael Droettboom wrote:
> I'm not aware of that problem. It should convert any PNG implicitly
> to our native RGBA format. Can you provide a PNG file that
> illustrates the breakage?
Sure; see http://morrislab.med.utoronto.ca/~dwf/bin.png
In [12]: x = imread('b
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 incide
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
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 T
