Question

我正在尝试遍历图像的像素，更具体地说是我通过ImageGrab模块获取的屏幕截图。这是我的代码：

from PIL import ImageGrab as ig
import numpy as np
from pynput.mouse import Controller
from pynput.keyboard import Key
from pynput import keyboard

mouse= Controller()

def onpress(key):

    try:
        pressed_key= key.char
    except AttributeError:
        pressed_key= str(key)[4:]

    if pressed_key == 'esc':
        print('Quitting process')
        return False

    elif pressed_key == 'space':
        mousepos= mouse.position
        pic= ig.grab()

        arr= np.array(pic)

        print(f'Pixel color at {mousepos}: RGB{arr[mousepos]}')
        # here the error is raised

with keyboard.Listener(on_press= onpress) as listener:
    listener.join()

我想在按下空格键时检查鼠标位置像素的RGB颜色。它适用于“最左上角”像素，下面是一些输出示例：

1) Pixel color at (150, 193): RGB[242 243 244]
2) Pixel color at (579, 302): RGB[0 0 0]
3) Pixel color at (887, 108): RGB[145 89 4]

但是当我在屏幕的右下角稍微移动鼠标（从中心到右下角一点点）时，会出现如下错误：

    Traceback (most recent call last):
  File "imagegrab.py", line 64, in <module>
    listener.join()
  File "C:\Users\marca\Anaconda3\lib\site-packages\pynput\_util\__init__.py", line 199, in join
    six.reraise(exc_type, exc_value, exc_traceback)
  File "C:\Users\marca\Anaconda3\lib\site-packages\six.py", line 692, in reraise
    raise value.with_traceback(tb)
  File "C:\Users\marca\Anaconda3\lib\site-packages\pynput\_util\__init__.py", line 154, in inner
    return f(self, *args, **kwargs)
  File "C:\Users\marca\Anaconda3\lib\site-packages\pynput\keyboard\_win32.py", line 237, in _process
    self.on_press(key)
  File "C:\Users\marca\Anaconda3\lib\site-packages\pynput\_util\__init__.py", line 75, in inner
    if f(*args) is False:
  File "imagegrab.py", line 42, in onpress
    print(f'{count}) Pixel color at {mousepos}: RGB{arr[mousepos]}')
IndexError: index 1152 is out of bounds for axis 0 with size 1080

如果使用加载图像，则不会出现此错误

pixels= pic.load()
print(f'{count}) Pixel color at {mousepos}: RGB{pixels[mousepos]}')

效果很好（这里我指的是屏幕的左上角和右下角）：

1) Pixel color at (0, 0): RGB(56, 36, 12)
2) Pixel color at (1914, 1016): RGB(22, 15, 5)

我认为这与笔记本电脑的屏幕DPI有关，就像以前一样，我不得不像以前一样in this Github thread应用建议的this kind of screen-capture problem.

如您所见，错误（1152）中显示的数组索引溢出了高清屏幕的普通1920x1080分辨率。我不知道如何解决此问题，所以我希望我已经清楚了，有人可以帮助我。

numpy array IndexError：索引超出了尺寸为1080的轴0的范围

0 个答案: