Re: [Numpy-discussion] Help with bit arrays

Paul, yes, imread() worked for reading the black and white TIFF. The situation improved, but now, there seems to be some problem with the color map. Example code: #!/usr/bin/env python3 import numpy from matplotlib import pyplot, cm img = pyplot.imread('oi-00.tiff') pyplot.imshow(img) pyplot.colorbar() pyplot.show() The code can open both 1-bit and 8-bit images, but only with 8 bits the image is shown with the colormap colors. The 1 bit image is shown as black and white. The questions: 1) Should Image.open() behave like pyplot.imread() ? Is this a bug in PIL ? 2) Why isn't the colormap working with black and white images ? 2016-04-29 13:06 GMT-03:00 Paul Hobson :

Does using pyplot.imgread work?

On Fri, Apr 29, 2016 at 8:27 AM, Henrique Almeida wrote:

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Any help with this problem ?

2016-04-27 11:35 GMT-03:00 Henrique Almeida :

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Hello, what's the current status on numpy for loading bit-arrays ?

I'm currently unable to correctly load black and white (1-bit) TIFF images. Code example follows:

from PIL import Image import numpy from matplotlib import pyplot

img = Image.open('oi-00.tiff') a = numpy.array(img)

^ does not work for 1-bit TIFF images

PIL source shows that it incorrectly uses typestr == '|b1'. I tried to change this to '|t1', but I get :

TypeError: data type "|t1" not understood

My goal is to make the above code to work for black and white TIFF images the same way it works for grayscale images. Any help ?

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