how to convert btw rgb and pixel value
hi 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? dn
It depends on the transformation you want to use, there is no method available in Numpy, but you can create your own in an instant. Matthieu 2007/11/5, devnew@gmail.com <devnew@gmail.com>:
hi 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? dn
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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. Nadav. On Sun, 2007-11-04 at 23:37 -0800, devnew@gmail.com wrote:
hi 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? dn
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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 def imread(fname,flatten=False): """Return a copy of a PIL image as a numpy array. *Parameters*: im : PIL image Input image. flatten : bool If true, convert the output to grey-scale. *Returns*: 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) if flatten: im = im.convert('F') return array(im) Cheers Stéfan 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.
Nadav.
On Sun, 2007-11-04 at 23:37 -0800, devnew@gmail.com wrote:
hi 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? dn
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Matthieu Brucher -
Nadav Horesh -
Stefan van der Walt