Python-更改图像的RGB值并另存为图像 [英] Python -- change the RGB values of the image and save as a image

问题描述

我已经可以读取图像的每个像素的RGB，但是我不知道如何将RGB的值更改为一半并另存为图像.谢谢.

I can read every pixel' RGB of the image already, but I don't know how to change the values of RGB to a half and save as a image.Thank you in advance.

from PIL  import *

def half_pixel(jpg):
  im=Image.open(jpg)
  img=im.load()
  print(im.size)
  [xs,ys]=im.size  #width*height

# Examine every pixel in im
  for x in range(0,xs):
     for y in range(0,ys):
        #get the RGB color of the pixel
        [r,g,b]=img[x,y] 

推荐答案

您可以在PIL中做所有想做的事情.

You can do everything you are wanting to do within PIL.

如果要将每个像素的值减少一半，可以执行以下操作:

If you are wanting to reduce the value of every pixel by half, you can do something like:

import PIL

im = PIL.Image.open('input_filename.jpg')
im.point(lambda x: x * .5)
im.save('output_filename.jpg')

您可以在此处查看有关点操作的更多信息: https ://pillow.readthedocs.io/zh-CN/latest/handbook/tutorial.html#point-operations

You can see more info about point operations here: https://pillow.readthedocs.io/en/latest/handbook/tutorial.html#point-operations

此外，您还可以执行以下任意像素操作: im[row, col] = (r, g, b)

Additionally, you can do arbitrary pixel manipulation as: im[row, col] = (r, g, b)

这篇关于Python-更改图像的RGB值并另存为图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！