MATLAB: How to create an image by replacing each pixel with mean RGB value.

Question

I need to create an image by replacing each pixel with the mean value of its RGB components.

Answer 1

Specify the dimension to the mean function. It will create a grayscale image

img = im2double(imread('peacock.jpg'));
img_mean = mean(img, 3);
 
fig = figure();
subplot(1, 2, 1);
imshow(img);
subplot(1, 2, 2);
imshow(img_mean);