图像填充

from PIL import Image

class padBaseImage():
    def __init__(self, fimage, pv=(255, 255, 255)):
        # fimage 图片文件
        self.img = Image.open(fimage)
        self.w = self.img.width
        self.h = self.img.height
        self.pv = pv  # 填充值

    def padding(self, pw, ph):
        img_ = Image.new('RGB', (self.w + pw, self.h + ph), self.pv)
        Image.Image.paste(img_, self.img, (pw // 2, ph // 2))

        return img_


class padSquareImage(padBaseImage):
    def __init__(self, fname, pv=(255, 255, 255)):
        super(padSquareImage, self).__init__(fname, pv)

    def squre_padding(self):
        pw = max(0, self.h - self.w)
        ph = max(0, self.w - self.h)
        img = self.padding(pw, ph)
        return img