python实现图片变亮或变暗的方法分析

python实现图片变亮或变暗是如何来实现的呢？下面的内容将会通过具体的实例来演示python实现图片变亮或变暗的实现方法及相关技巧：

import Image

# open an image file (.jpg or.png) you have in the working folder

im1 = Image.open("angelababy.jpg")

# multiply each pixel by 0.9 (makes the image darker)

# works best with .jpg and .png files, darker < 1.0 < lighter

# (.bmp and .gif files give goofy results)

# note that lambda is akin to a one-line function

im2 = im1.point(lambda p: p * 0.5)

# brings up the modified image in a viewer, simply saves the image as

# a bitmap to a temporary file and calls viewer associated with .bmp

# make certain you have associated an image viewer with this file type

im2.show()

# save modified image to working folder as Audi2.jpg

im2.save("angelababy2.jpg")