how to create a white image?

I would like to create a NxM white image. But how to put color vectors [256 256 256] into a 2D array?

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Try this to create a grayscale image:

whiteImage = 255 * ones(N, M, 'uint8');
imshow(whiteImage);

To create an RGB image, try this:

whiteImage = 255 * ones(480, 640, 3, 'uint8');
imshow(whiteImage);

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how to create a white image?

how to create a white image?