def Grayscale(alpha=<NUM_LIT:0>, from_colorspace="<STR_LIT>", name=None, deterministic=False, random_state=None):
if name is None:<EOL><INDENT>name = "<STR_LIT>" % (ia.caller_name(),)<EOL><DEDENT>return ChangeColorspace(to_colorspace=ChangeColorspace.GRAY, alpha=alpha, from_colorspace=from_colorspace,<EOL>name=name, deterministic=deterministic, random_state=random_state)<EOL>
Augmenter to convert images to their grayscale versions.

NOTE: Number of output channels is still 3, i.e. this augmenter just "removes" color.

TODO check dtype support

dtype support::

    * ``uint8``: yes; fully tested
    * ``uint16``: ?
    * ``uint32``: ?
    * ``uint64``: ?
    * ``int8``: ?
    * ``int16``: ?
    * ``int32``: ?
    * ``int64``: ?
    * ``float16``: ?
    * ``float32``: ?
    * ``float64``: ?
    * ``float128``: ?
    * ``bool``: ?

Parameters
----------
alpha : number or tuple of number or list of number or imgaug.parameters.StochasticParameter, optional
    The alpha value of the grayscale image when overlayed over the
    old image. A value close to 1.0 means, that mostly the new grayscale
    image is visible. A value close to 0.0 means, that mostly the
    old image is visible.

        * If a number, exactly that value will always be used.
        * If a tuple ``(a, b)``, a random value from the range ``a <= x <= b`` will
          be sampled per image.
        * If a list, then a random value will be sampled from that list per image.
        * If a StochasticParameter, a value will be sampled from the
          parameter per image.

from_colorspace : str, optional
    The source colorspace (of the input images).
    Allowed strings are: ``RGB``, ``BGR``, ``GRAY``, ``CIE``, ``YCrCb``, ``HSV``, ``HLS``, ``Lab``, ``Luv``.
    See :func:`imgaug.augmenters.color.ChangeColorspace.__init__`.

name : None or str, optional
    See :func:`imgaug.augmenters.meta.Augmenter.__init__`.

deterministic : bool, optional
    See :func:`imgaug.augmenters.meta.Augmenter.__init__`.

random_state : None or int or numpy.random.RandomState, optional
    See :func:`imgaug.augmenters.meta.Augmenter.__init__`.

Examples
--------
>>> aug = iaa.Grayscale(alpha=1.0)

creates an augmenter that turns images to their grayscale versions.

>>> aug = iaa.Grayscale(alpha=(0.0, 1.0))

creates an augmenter that turns images to their grayscale versions with
an alpha value in the range ``0 <= alpha <= 1``. An alpha value of 0.5 would
mean, that the output image is 50 percent of the input image and 50
percent of the grayscale image (i.e. 50 percent of color removed).