[Numpy-discussion] how to convert btw rgb and pixel value
Stefan van der Walt
stefan at sun.ac.za
Mon Nov 12 16:08:40 EST 2007
Since PIL Images now have array interfaces, it has become a lot
simpler. The following should do the job:
from numpy import array
from PIL import Image
"""Return a copy of a PIL image as a numpy array.
im : PIL image
flatten : bool
If true, convert the output to grey-scale.
img_array : ndarray
The different colour bands/channels are stored in the
third dimension, such that a grey-image is MxN, an
RGB-image MxNx3 and an RGBA-image MxNx4.
im = Image.open(fname)
im = im.convert('F')
On Mon, Nov 05, 2007 at 12:58:45PM +0200, Nadav Horesh wrote:
> If the image is in the form of a standard image format (png, bmp, jpeg...) you
> can use the PIL library. png file can be read by pylab's imread function.
> On Sun, 2007-11-04 at 23:37 -0800, devnew at gmail.com wrote:
> i wish to convert an rgb image into an array of double values..is
> there a method for that in numpy?
> also i want to create an array of doubles into corresponding rgb
> tuples of an image
> can anyone guide me?
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