python切圖，地圖切圖腳本

python 切圖，地圖切圖腳本

'''
讀入一個圖片，切成指定數目個小圖片(64個)
文件夾名out
'''
from PIL import Image
import sys,os
cut_num = 8 # 8*8=64個圖片
#將圖片填充爲正方形
def fill_image(image):
  width, height = image.size  
  #選取長和寬中較大值作爲新圖片的
  new_image_length = width if width > height else height  
  #生成新圖片[白底]
  #new_image = Image.new(image.mode, (new_image_length, new_image_length), color='white')  
  new_image = Image.new(image.mode, (new_image_length, new_image_length))
  #將之前的圖粘貼在新圖上，居中 
  if width > height:#原圖寬大於高，則填充圖片的豎直維度
  #(x,y)二元組表示粘貼上圖相對下圖的起始位置
    new_image.paste(image, (0, int((new_image_length - height) / 2)))
  else:
    new_image.paste(image, (int((new_image_length - width) / 2),0))
  return new_image
#切圖
def cut_image(image):
  width, height = image.size
  item_width = int(width / cut_num)
  box_list = []  
  # (left, upper, right, lower) 
  for i in range(0,cut_num):#兩重循環，生成圖片基於原圖的位置 
    for j in range(0,cut_num):      
      #print((i*item_width,j*item_width,(i+1)*item_width,(j+1)*item_width))
      box = (j*item_width,i*item_width,(j+1)*item_width,(i+1)*item_width)
      box_list.append(box)
 
  image_list = [image.crop(box) for box in box_list]  
  return image_list
#保存
def save_images(image_list):
  index = 1
  for image in image_list:
    image = image.resize((256, 256),Image.ANTIALIAS)
    image.save('out/image_'+str(index) + '.jpg', 'JPEG')
    index += 1
 
if __name__ == '__main__':
  file_path = "temp.jpg"
  os.mkdir("out")
  image = Image.open(file_path)  
  #image.show()
  image = fill_image(image)
  image_list = cut_image(image)
  save_images(image_list)

非原創，作者不詳