Philipp Lies wrote:
> On 02/12/2010 07:49 PM, Eric Firing wrote:
>
>> Philipp Lies wrote:
>>
>>> Hi,
>>>
>>> is there a backend that supports 16bit tiff images?
>>>
The macosx backend supports tiff.
-Jeff
>> Can you just use png, and use the netpbm utilities or ImageMagick
>> convert program to go to and from tiff?
>>
> Would be 'dirty' but acceptable if matplotlib would support saving
> uncompressed grayscale uint16 png files. But saving nxm uint16 arrays
> leads to nxmx3 float arrays which do not even closely resemble my
> original data.
> Example:
> A
> array([[47705, 11865, 739, 16941, 37700],
> [64321, 26860, 49945, 63556, 13498],
> [ 2676, 7720, 5995, 22399, 32735],
> [56577, 34443, 6636, 23409, 61331],
> [ 1020, 26013, 34677, 37262, 36136]], dtype=uint16)
> imsave('t.png',A)
> B = imread('t.png')
> B[:,:,0]
>
> array([[ 1., 0., 0., 0., 0.74117649],
> [ 0.49803922, 0.19607843, 1., 0.5529412 , 0. ],
> [ 0., 0., 0., 0., 0.48627451],
> [ 1., 0.57647061, 0., 0.01960784, 0.71372551],
> [ 0., 0.14509805, 0.58823532, 0.72941178, 0.66666669]],
> dtype=float32)
>
>
>
>>> According to the website GDK supports tiff but that's wrong:
>>>
>>>
>>>>>> import matplotlib
>>>>>> matplotlib.use('GDK')
>>>>>> import matplotlib.pyplot as pyplot
>>>>>> pyplot.imsave(arr=X, fname='test.tif')
>>>>>>
>>> Traceback (most recent call last):
>>> File "<stdin>", line 1, in <module>
>>> File "/usr/lib/pymodules/python2.6/matplotlib/pyplot.py", line 1425,
>>> in imsave
>>> return _imsave(*args, **kwargs)
>>> File "/usr/lib/pymodules/python2.6/matplotlib/image.py", line 813, in
>>> imsave
>>> fig.savefig(fname, dpi=1, format=format)
>>> File "/usr/lib/pymodules/python2.6/matplotlib/figure.py", line 1033,
>>> in savefig
>>> self.canvas.print_figure(*args, **kwargs)
>>> File "/usr/lib/pymodules/python2.6/matplotlib/backend_bases.py", line
>>> 1420, in print_figure
>>> '%s.' % (format, ', '.join(formats)))
>>> ValueError: Format "tif" is not supported.
>>> Supported formats: emf, eps, pdf, png, ps, raw, rgba, svg, svgz.
>>>
>>>>>> matplotlib.backends.backend
>>>>>>
>>> 'gdk'
>>>
>>> matplotlib 0.99.0 python 2.6.4 ubuntu karmic x64
>>>
>>> If matplotlib cannot provide tiff support, does someone know an
>>> alternative? PIL doesn't work either, at least not intuitively.
>>>
>>> Cheers
>>>
>>> Philipp
>>>
>>>
>
>
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