Add padding/black/colored edge to images

Add Padding/Black/Colored Edge to Images
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PIL.ImageOps.pad(image, size, method=3, color=None, centering=0.5, 0.5)
         image: The image for adjusting.
         size: The defined size of the output image.
         method: Defult method is PIL.Image.BICUBIC. Other methods are PIL.Image.NEAREST, PIL.Image.BOX, PIL.Image.BILINEAR, PIL.Image.HAMMING, PIL.Image.BICUBIC, and PIL.Image.LANCZOS.
         color: Background color.
         centering: The position of the center of the origional image. (0.5，0.5）: The image center is at the center of the output image; （0，0): The top-left corner is aligned with the top left corner of the original image; 1，1）: The bottom-right corner is aligned with the bottom left corner of the original image.

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PIL pads image edges. code:
                  Replace a letter by seek
        Input:

       Output:

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PIL pads image edges. code:
                  Replace a letter by seek
        Input:

       Output:

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Numpy pads image edges. code:
                  Replace a letter by seek
        Input:

       Output:

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Numpy reflects image. code:
                  Replace a letter by seek
        Input:

       Output:

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Torch pad edge. code:
                  Replace a letter by seek
        Input:

       Output:

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