使用 python 查找图像中最暗的颜色

Question

I was just wondering you could find the darkest colour in a greyscale image with python. I would prefer using pillow but OpenCV would be fine. I found this but couldn't make sense of it. If this is simple just say.

Thanks

** edit **

The issue that I have is that with the rest of the script the darkest colour is very unlikely to be black.

Answer 1

So in the image, after you read using OpenCV or Pillow, and because it is grayscale, the darkest "color" should be 0, which is black. The range of pixel values is from 0 and 255. If you want to find the darkest value, you can just use the minimal function.

import cv2
img = cv2.imread("2.png", 0)
print(min(img.flatten()))

"For grayscale images, the pixel value is a single number that represents the brightness of the pixel. The most common pixel format is the byte image, where this number is stored as an 8-bit integer giving a range of possible values from 0 to 255. Typically zero is taken to be black, and 255 is taken to be white."

Reference: https://homepages.inf.ed.ac.uk/rbf/HIPR2/value.htm