如何获取具有特定颜色的图像的像素值？

Question

Hello can I get the value of an pixel with color? I'm trying to path this 10x10 pixel image where I want to print and path the value of pixel that are not white? I'm using this image 10x10 pixel as an image.

For Example This is a 10x10 pixel [0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0]

I want to change the value of 0 to 1 if there are present color in the pixel other than white?

I want to use python for this problem.

Answer 1

Let's assume the picture is in RGB format, it means the picture has 3 color channels. If you want to map the picture to a mask you could use the following:

img = cv2.imread("picture path")
mask = img[:, :] == [255, 255, 255]

• cv2 is the opencv-python library
• imread reads the image from the file
• np.sum(img, axis=2) == 765 creates an array of boolean values

The sum function adds up the channel values of each pixel. If a pixel is white, then its RGB value is (255, 255, 255). So, if you sum the channel values, then every white pixel will have the value 765.