How to show an image?

I would like to display a matrix as an image. The matrix is of size 250 2. I used image() function. But got an error stating an error.

CIJ=cell2mat(Cipher);
kk=CIJ*(1/100);

Cipher is of size 250 2. I tried to display kk, but I got a blue image. It must be a black and white image know? How to solve this issue?

[Dennis]

why do you expect a black and white image? you can use colormap to change colors

[Darsana P M]

How to use colormap function?

Answer 1

[Walter Roberson]

image(kk)
colormap(gray(256))

[Darsana P M]

That helped me. Thanks sir