Transform RGB image to grayscale but keep format as RBG

Hi all,

I have a imageDatastore of jpeg images, and I'm trying to transform all the images to grayscale, however I want to keep dimensions of the images the same (m x n, 3).

I was hoping to use rbg2gray, however I cannot compare the original and grayscale images as the dimensions are not consistent.

Thanks.

Answer 1

[darova]

You can use repmat or cat to create 3D matrix

I1 = rgb2gray(I);
I2 = cat(3,I1,I1,I1);       % gray image as 3D matrix
%I2 = repmat(I1,[1 1 3]);   % gray image as 3D matrix