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PIL: problem to convert an image array to PIL format
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Sverre
Dec 17, 2009, 7:14:20 AM12/17/09
to
After converting a PIL image in memory to an array with numpy.asarray
(), I make a adthreshold() with pymorph() with the result, that all
pixels in the array are either false or true (boolean). But my try to
convert this back into PIL format is failing
(), I make a adthreshold() with pymorph() with the result, that all
pixels in the array are either false or true (boolean). But my try to
convert this back into PIL format is failing
img = Image.fromarray(rawimg, '1')
because a true will be interpreted as integer 1 ), so that 7 pixels
are black and one white. Has someone a solution, so that a picture
inly with "true" values doesn't look like this?
Peter Otten
Dec 17, 2009, 9:45:34 AM12/17/09
to
Sverre wrote:
This has come up before, see
http://mail.python.org/pipermail/python-list/2009-October/1221578.html
Image.fromarray() expects one bit per pixel but actually gets one byte. One
possible workaround: introduce an intermediate array with a format
understood by fromarray():
>>> import numpy
>>> from PIL import Image
>>> rawimg = numpy.zeros((20, 20), bool)
>>> rawimg[:10, :10] = rawimg[10:, 10:] = True
>>> b = numpy.array(rawimg, numpy.uint8)
>>> b *= 255
>>> Image.fromarray(b).save("tmp.jpg")
Peter
Sverre
Dec 17, 2009, 11:33:44 AM12/17/09
to
On 17 Des, 15:45, Peter Otten <__pete...@web.de> wrote:
>
> This has come up before, see
>
> http://mail.python.org/pipermail/python-list/2009-October/1221578.html
>
>
> This has come up before, see
>
> http://mail.python.org/pipermail/python-list/2009-October/1221578.html
>
> Peter
Thank you!
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