how to preserve RGB values of an image while making it gray image

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ASHWIN JOSHY on 2 May 2022
Edited: DGM on 2 May 2022
I need to convert an RGB image to gray image, but after processing i want the image back to RGB,
So how can i preserve the RGB values of an image
I am using
to read the image
  1 Comment
Dyuman Joshi
Dyuman Joshi on 2 May 2022
Store the image in a variable and use rgb2gray to store in another variable?

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Accepted Answer

DGM on 2 May 2022
Edited: DGM on 2 May 2022
You don't. When you convert a color image to grayscale, you are discarding the color information. It's gone.
If you want to keep the color image, simply keep the color image and make a grayscale copy.
rgbpict = imread('peppers.png');
graypict = rgb2gray(rgbpict); % BT601 luma
If instead you intend to do some operations on the color image by using the grayscale image as a proxy, I'd have to know what kind of operation you're trying to do. If that's your intent, you'll have to describe the task.

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