'**SUMMARY**
Returns true if this image uses the Gray colorspace.
**RETURNS**
True if the image uses the Gray colorspace, False otherwise.
**EXAMPLE**
>>> if( img.isGray() ):
>>>    print "The image is in Grayscale."
**SEE ALSO**
:py:meth:`toGray`'

def isGray(self):

    return (self._colorSpace == ColorSpace.GRAY)
