如何获取 python 区域中所有像素的颜色

Question

I'm trying to write a program on linux that does something if the pixels in an area aren't all the same color, for example:

if color not "255, 255, 255":
    #do something

this is what i have for one pixel:

import time, pyautogui
time.clock()
image = pyautogui.screenshot()
color = image.getpixel((1006, 553))
print(time.clock())
print(color)

I know how to get the color of a pixel using .getpixel() but that only gets one pixel

Basically, how do i get the color of an area of pixels when i know all the pixels in that area are the same color.

Also, as quick as possible, like 0.5s or under.

Answer 1

I keep recommending it, but the scikit-image library is pretty great, and they have some really solid documentation and examples. I would recommend a combo of that and using numpy arrays directly. It is just a lot faster when working directly with pixels. You will have to convert the PIL image to a numpy array ...but this should work with that:

import pyautogui
import numpy as np

image = pyautogui.screenshot()
np_image = np.array(image)

You can slice the image:

red_slice = np_image[0:50, 0:50,0]
red_mask = red_slice == 200

This would give you the values for red in the upper right 50x50 pixel area. red_mask is an array of True / False values whether each red value in that area is equal to 200 . This can be repeated for the other channels as you see fit.