drow a image only by a matrix

If I have a image's matrix( for example a matrix 300*400) , how do I drow this matrix as a image? Also depends on the type of photo?

Answer 1

[Thomas]

Maybe imshow will help

eg:

 c=rand(300,400);    % generate random matrix data
 imshow(c)

[Ryan]

to further the demonstration with a "color" image:

 c(:,:,1) = rand(300,400); % R
 c(:,:,2) = rand(300,400); % G
 c(:,:,3) = rand(300,400); % B
 figure,imshow(c)

[Fatima prv]

yes, thanks. But Data matrix are only 0 and 1, and when I use this command shows a completely black!!

[Thomas]

Does the following work

 imshow(c,[0 1])

[Fatima prv]

yes, It was clearer. explain about this command please.

[Thomas]

it gray scales the image in the range 0 and 1.

You can find more about MAtlab commands using the doc command.. so to find help on imshow command use..

 doc imshow

[Ryan]

What is the result of unique(image_matrix)? Does imshow(image_matrix,[]) work?

[Fatima prv]

no , this command show all of number that used in image matrix as a vector.