Sverre wrote: > 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 > > 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? > > http://img707.imageshack.us/img707/6051/p012.jpg
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 -- http://mail.python.org/mailman/listinfo/python-list
