Python用PIL将PNG图像合成gif时如果背景为透明时图像出现重影的解决办法

 1 disposal = int(im.encoderinfo.get("disposal", 0))
 2  
 3     if transparent_color_exists or duration != 0 or disposal:
 4         packed_flag = 1 if transparent_color_exists else 0
 5         packed_flag |= disposal << 2
 6         if not transparent_color_exists:
 7             transparency = 0
 8  
 9         fp.write(
10             b"!"
11             + o8(249)  # extension intro
12             + o8(4)  # length
13             + o8(packed_flag)  # packed fields
14             + o16(duration)  # duration
15             + o8(transparency)  # transparency index
16             + o8(0)

 1 from PIL import Image
 2  
 3 img = Image.open("dabai.gif")
 4 try:
 5     flag = 0
 6     while True:
 7         #获取每一帧
 8         img.seek(flag) 
 9         #保存
10         img.save("pics/{}.png".format(flag))
11         pic = Image.open("pics/{}.png".format(flag))
12         #转化
13         pic = pic.convert("RGBA")
14         #替换背景为透明
15         color = pic.getpixel((0,0))
16         for i in range(pic.size[0]):
17             for j in range(pic.size[1]):
18                 dot = (i,j)
19                 rgba = pic.getpixel(dot)
20                 if rgba == color:
21                     rgba = rgba[:-1] + (0,)
22                     pic.putpixel(dot, rgba)
23         #保存
24         pic.save("pics/{}.png".format(flag))
25         flag +=1
26 except BaseException as e:
27     pass

 1 #!/usr/bin/env python
 2 # -*- coding: utf-8 -*-
 3  
 4 from PIL import Image
 5 import os
 6 photo_list = []
 7 #获取保存的PNG图像
 8 pic_list = os.listdir("pics/")
 9 #对图像List排序，防止图像位置错乱
10 pic_list.sort(key=lambda x:int(x[:-4]))
11 for k in pic_list:
12     pic_p = Image.open("pics/{}".format(k))
13     photo_list.append(pic_p)
14 #保存图像，disposal可以为2或者3，但是不能为1或0，切记，其他自定义未尝试
15 photo_list[0].save("dabai_new.gif", save_all=True, append_images=photo_list[1:],duration=40,transparency=0,loop=0,disposal=3)