Python之修改图片像素值的方法

# -*- coding:utf8 -*-
import os
 
from PIL import Image
im = Image.open('123.png')#打开图片
pix = im.load()#导入像素
width = im.size[0]#获取宽度
height = im.size[1]#获取长度
 
for x in range(width):
  for y in range(height):
    r,g,b,a = im.getpixel((x,y))	
    rgba=(r,g,b,a)
    if(a==0):
      im.putpixel((x,y),(0,0,0,0))
    if(a==255):
      im.putpixel((x,y),(255,255,255,255))
 
im = im.convert('RGB')
im.save('456.png')

# -*- coding:utf8 -*-
import os
from PIL import Image
 
path = 'SegmentationClass(RGBA)/'
savedpath = 'SegmentationClass/'
filelist = os.listdir(path)
for item in filelist:
  im = Image.open( path + item )#打开图片
  width = im.size[0]#获取宽度
  height = im.size[1]#获取长度
 
  for x in range(width):
    for y in range(height):
      r,g,b,a = im.getpixel((x,y))	
      if(a==0):
        im.putpixel((x,y),(0,0,0,0))
      if(a==255):
        im.putpixel((x,y),(255,255,255,255))
  im = im.convert('RGB')
  im.save(savedpath + item)
  print('item of %s is saved '%(item))