This article example describes the python method to realize the picture brighten or darken. Shared for your reference. Specific implementation methods are as follows:
import Image
# open an image file (.jpg ) you have in the working folder
im1 = ("")
# 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 = (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
()
# save modified image to working folder as
("")
The running effect is shown below:
I hope that what I have described in this article will help you in your Python programming.