PIL
切割使用的Python PIL库的 Image.crop
示例:

from PIL import Image
im = Image.open("hopper.jpg")
(left, upper, right, lower) = (20, 20, 100, 100)
im_crop = im.crop((left, upper, right, lower))

left 距离左边 边距 可看做x坐标
upper 距离右边边距 可看做 y坐标
right > 另一个距离左边 边距 可看做x + width 坐标
lower 另一个距离右边边距 可看做 y + height 坐标

因此必须遵守如下规则 ：
right > left
lower > upper

API

PIL Image API

示例代码

# -*-coding utf8 -*-
from  PIL import Image
import json
import os

# 读取配置解析数据
def  decodeJson ():
    path = 'res/scenery.json'
    json_str = ''
    f = open(path, "r", encoding="utf-8")
    json_str = f.read()
    # 转换为字典
    obj = json.loads(json_str)
    return obj
    
# 切割图片
def split(jsonData): 
    # 当前目录
    wd = os.getcwd()
    img = Image.open(jsonData['file'])
    width = jsonData['width']
    heigth = jsonData['heigth']
    texture = jsonData['texture']
    id = jsonData['id']
    for key in texture:
           item = texture[key]
           item_x = item[ "x"]
           item_y = item[ "y"]
           item_width = item[ "width"]
           item_height = item[ "height"]
           box = (item_x,item_y,item_x + item_width ,item_y + item_height)
           regx = img.crop(box)
           if not os.path.exists(wd + '/cut'):
               os.makedirs(wd + '/cut') 
           if not os.path.exists(wd + '/cut/'+id):
               os.makedirs(wd + '/cut/'+id)   

           item_img = wd+ "/cut/"+id +"/"+ key + ".png"
           regx.save(item_img)
    print('split '+jsonData['file'] +' end '  )



def main():
    print('decode res')
    jsonData = decodeJson()
    split(jsonData)


if __name__ == '__main__':
    main()