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Bug fix: Ignore alpha channel when opening RGBA image as grayscale

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This commit is contained in:
Neil Yager
2011-10-25 08:52:13 +01:00
parent 0b8452fa8e
commit d56ae9631c
1 changed files with 7 additions and 3 deletions
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skimage/color/colorconv.py
+7 -3
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@@ -472,7 +472,8 @@ def rgb2grey(rgb):
Parameters
----------
rgb : array_like
The image in RGB format, in a 3-D array of shape (.., .., 3).
The image in RGB format, in a 3-D array of shape (.., .., 3),
or in RGBA format with shape (.., .., 4).
Returns
-------
@@ -482,7 +483,8 @@ def rgb2grey(rgb):
Raises
------
ValueError
If `rgb2grey` is not a 3-D array of shape (.., .., 3).
If `rgb2grey` is not a 3-D array of shape (.., .., 3) or
(.., .., 4).
References
----------
@@ -494,6 +496,8 @@ def rgb2grey(rgb):
CRT phosphors::
Y = 0.2125 R + 0.7154 G + 0.0721 B
If there is an alpha channel present, it is ignored.
Examples
--------
@@ -505,6 +509,6 @@ def rgb2grey(rgb):
>>> lena = imread(os.path.join(data_dir, 'lena.png'))
>>> lena_grey = rgb2grey(lena)
"""
return _convert(grey_from_rgb, rgb)[..., 0]
return _convert(grey_from_rgb, rgb[:, :, :3])[..., 0]
rgb2gray = rgb2grey