Transform RGB image to grayscale but keep format as RBG

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Gazebo
Gazebo 2020-2-18
回答： darova 2020-2-18
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.

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回答（1 个）

darova
darova 2020-2-18
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

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