Why the outcome of my code is just white image?

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Hi, I need to use conv2 to do my image processing assignment. I need to make a mean filter for smoothing but the outcome is always a white image. Here is my code
kernel = ones(3, 3) / 9; % 3x3 mean kernel
out = conv2(img1, kernel, 'same'); % Convolve keeping size of I
imshow(out)
What could be the problem?

Accepted Answer

Matt J
Matt J on 23 Sep 2022
Edited: Matt J on 23 Sep 2022
Give imshow() a second argument to see the desired grayscale range.
img1=im2gray(imread('cameraman.tif'));
kernel = ones(3, 3) / 9; % 3x3 mean kernel
out = conv2(img1, kernel, 'same'); % Convolve keeping size of I
imshow(out,[]); colorbar

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