from PIL import Image

#新建一个空白文件 大小为1600*1600 颜色为白色

newIm= Image.new('RGB', (1600, 1600), 'white')

#打开第1张图备用合并

im1 = Image.open(r"D:\缓存\合并\QQ截图20181020105858.jpg")

#打开第2张图备用合并

im2 = Image.open(r"D:\缓存\合并\QQ截图20181020105858.jpg")

#打开第3张图备用合并

im3 = Image.open(r"D:\缓存\合并\QQ截图20181020105858.jpg")

#打开第4张图备用合并

im4 = Image.open(r"D:\缓存\合并\QQ截图20181020105858.jpg")

list=[im1,im2,im3,im4]

x=0

y=0

for i in list:

    print(i.size)

    xx=i.size[0]

    yy=i.size[1]

    # copy图层,crop((左，顶，右，底))

    cropedIm = i.crop((0, 0, int(xx),int(yy)))

    # paste图层 paste(cropedIm,左，顶)

    newIm.paste(cropedIm, (int(x+((800-i.size[0])/2)) ,int(y+((800-i.size[1])/2))))

    if y==0:

        y+=800

    else:

        y=0

        x+=800

newIm.save(r'D:\缓存\1.png')