rgb2grey
-
skimage.color.rgb2grey(rgb)
[source] -
Compute luminance of an RGB image.
Parameters: rgb : array_like
The image in RGB format, in a 3-D array of shape
(.., .., 3)
, or in RGBA format with shape(.., .., 4)
.Returns: out : ndarray
The luminance image, a 2-D array.
Raises: ValueError
If
rgb2gray
is not a 3-D array of shape(.., .., 3)
or(.., .., 4)
.Notes
The weights used in this conversion are calibrated for contemporary CRT phosphors:
Y = 0.2125 R + 0.7154 G + 0.0721 B
If there is an alpha channel present, it is ignored.
References
[R49] http://www.poynton.com/PDFs/ColorFAQ.pdf Examples
>>> from skimage.color import rgb2gray >>> from skimage import data >>> img = data.astronaut() >>> img_gray = rgb2gray(img)
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