图片指定大小切割拼接 ​

import os
    from PIL import Image

    '''
    切割图片
    '''
    def breakup(src, rownum, colnum):

        # xxx/xxx/ xxx.png
        s = os.path.split(src)
        # xxx.png
        fn = os.path.splitext(s[1])
        # xxx
        basename = fn[0]
        # .png
        ext = fn[1]

        num = 0

        img = Image.open(src)
        w, h = img.size
        if rownum <= h and colnum <= w:
            rowheight = h // rownum
            colwidth = w // colnum
            for r in range(rownum):
                for c in range(colnum):
                    box = (c * colwidth, r * rowheight, (c + 1) * colwidth,
                           (r + 1) * rowheight)
                    img.crop(box).save(os.path.join(os.getcwd() +
                            "/image/breakup/", basename + '_' +
                            str(num)  + ext), ext[1:])
                    num+=1

    '''
    合并图片
    '''
    def reorganize(dir,prefix,rownum, colnum,w,h):
        ls = os.listdir(dir)
        image = Image.new('RGB', (colnum*w, rownum*h))
        x = 0
        y = 0
        for i in range(0, len(ls)):
            try:
                img = Image.open(dir+"/"+ prefix +"_"+ str(i) + ".png")
            except IOError:
                print("Error")
            else:
                img = img.resize((w, h), Image.ANTIALIAS)
                image.paste(img, (x * w, y * h))
                x += 1
                if x == colnum:
                    x = 0
                    y += 1
            image.save(os.getcwd() + "/image/to/all.jpg")


    if __name__ == '__main__':
        breakup(os.getcwd() + "/image/from/bbb.png",4,10)
        reorganize(os.getcwd() + "/image/breakup","bbb",2,20,30,46)
        ```

import os
    from PIL import Image

    '''
    切割图片
    '''
    def breakup(src, rownum, colnum):

        # xxx/xxx/ xxx.png
        s = os.path.split(src)
        # xxx.png
        fn = os.path.splitext(s[1])
        # xxx
        basename = fn[0]
        # .png
        ext = fn[1]

        num = 0

        img = Image.open(src)
        w, h = img.size
        if rownum <= h and colnum <= w:
            rowheight = h // rownum
            colwidth = w // colnum
            for r in range(rownum):
                for c in range(colnum):
                    box = (c * colwidth, r * rowheight, (c + 1) * colwidth,
                           (r + 1) * rowheight)
                    img.crop(box).save(os.path.join(os.getcwd() +
                            "/image/breakup/", basename + '_' +
                            str(num)  + ext), ext[1:])
                    num+=1

    '''
    合并图片
    '''
    def reorganize(dir,prefix,rownum, colnum,w,h):
        ls = os.listdir(dir)
        image = Image.new('RGB', (colnum*w, rownum*h))
        x = 0
        y = 0
        for i in range(0, len(ls)):
            try:
                img = Image.open(dir+"/"+ prefix +"_"+ str(i) + ".png")
            except IOError:
                print("Error")
            else:
                img = img.resize((w, h), Image.ANTIALIAS)
                image.paste(img, (x * w, y * h))
                x += 1
                if x == colnum:
                    x = 0
                    y += 1
            image.save(os.getcwd() + "/image/to/all.jpg")


    if __name__ == '__main__':
        breakup(os.getcwd() + "/image/from/bbb.png",4,10)
        reorganize(os.getcwd() + "/image/breakup","bbb",2,20,30,46)
        ```