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

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ASHWIN JOSHY
ASHWIN JOSHY 2022-5-2
编辑： DGM 2022-5-2
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
RGBImage=imread('RGBImage.tiff')
to read the image

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DGM
DGM 2022-5-2
编辑：DGM 2022-5-2
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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