python - change a colored image represented as a numpy ndarray to greyscale

Question

I have an image, loaded from a file thus:

img = misc.imread('mypic.jpg')

it is a 3 dimensional, RGB numpy.ndarray. I wish to turn it into a greyscale ndarray (1-D).

Answer 1

I don't know if I understood your question, but I think this should do what you want:

img = misc.imread('mypic.jpg', flatten=True)

See the documentation: http://docs.scipy.org/doc/scipy/reference/generated/scipy.misc.imread.html