How to change one pixel only in plain image?

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Arshub
Arshub 2022-1-20
回答： Kevin Holly 2022-1-20
How can I change one pixel in an image?
I need this to calculation NPCR and UACI between to cipher images whose plain images have only a one-pixel difference. hence, ineed original image and original image with edit value of on pixel only to encrypt them.

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Kevin Holly
Kevin Holly 2022-1-20
Ran in:
I = imread('peppers.png');
imshow(I)
size(I)
ans = 1×3
384 512 3
I(45,45,1) = 255; % red
I(45,45,2) = 255; % green
I(45,45,3) = 255; % blue
imshow(I)
grayscale_I = rgb2gray(I);
imshow(grayscale_I)
size(grayscale_I)
ans = 1×2
384 512
I(45,45) = 255;
imshow(I)

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