import os
from PIL import Image

def splitimage(src, rownum, colnum, dstpath):
  img = Image.open(src)
  w, h = img.size
  if rownum <= h and colnum <= w:
    print('Original image info: %sx%s, %s, %s' % (w, h, img.format, img.mode))
    print('开始处理图片切割, 请稍候...')

    s = os.path.split(src)
    if dstpath == '':
      dstpath = s[0]
    fn = s[1].split('.')
    basename = fn[0]
    ext = fn[-1]

    num = 0
    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(dstpath, basename + '_' + str(num) + '.' + ext), ext)
        num = num + 1

    print('图片切割完毕，共生成 %s 张小图片。' % num)
  else:
    print('不合法的行列切割参数！')

src = input('请输入图片文件路径：')
if os.path.isfile(src):
  dstpath = input('请输入图片输出目录（不输入路径则表示使用源图片所在目录）：')
  if (dstpath == '') or os.path.exists(dstpath):
    row = int(input('请输入切割行数：'))
    col = int(input('请输入切割列数：'))
    if row > 0 and col > 0:
      splitimage(src, row, col, dstpath)
    else:
      print('无效的行列切割参数！')
  else:
    print('图片输出目录 %s 不存在！' % dstpath)
else:
  print('图片文件 %s 不存在！' % src)