读取像素值数组python

Question

I would like to take a screenshot with a certain range of the screen, and then I would like to check the pixel values of certain lines (eg x_axis from 400 to 800). I tried multiple ways like the imagegrab, gdi32.GetPixel and some more. It seems reading pixels values take a lot of time, so I even tried converting it into a list, something like this

im = ImageGrab.grab(box)
pixels = list(im .getdata())

Even this does not seem fast. Is there something I'm doing wrong?

Answer 1

ImageGrab returns pixels in PIL format (the Python Imaging Library: http://effbot.org/imagingbook/image.htm ), and .getdata() already returns the pixels as a sequence. By wrapping it in list() again you are doing the same (expensive) operation twice. You can just do:

im = ImageGrab.grab(box)
pixels = im.getdata()

And iterate through your pixels in your favorite way.