imageutil.py 文件源码

def change_contrast(image, contrast=1.0):
    """
    Change contrast of image.

    >>> image = np.eye(3, dtype='uint8') * 255
    >>> change_contrast(image, 0.5)
    array([[170,  42,  42],
           [ 42, 170,  42],
           [ 42,  42, 170]], dtype=uint8)

    See
    http://pillow.readthedocs.io/en/3.1.x/reference/ImageEnhance.html#PIL.ImageEnhance.Contrast

    :param numpy array image: Numpy array with range [0,255] and dtype 'uint8'.
    :param float contrast: Contrast [0, 1]
    :return: Image with changed contrast
    :rtype: numpy array with range [0,255] and dtype 'uint8'
    """
    return enhance(image, ie.Contrast, contrast)