reading and viewing image "Image Hiding"

Hi every one,

I'm working on image steganography and it works very well but later i noticed when i first read image (512x512x8) even before doing anything concerning image hiding the displayed image look like attached one,

bw = double (imread('barbara512.bmp'));
imshow(bw,[])

any ideas why?

thanks in advance.

[Walter Roberson]

Do not use double(imread()) for this purpose. Use im2double(imread()) . And try imshow() without the []

The variable you are using hints you are expecting black and white, but it looks to me as if you probably are using grayscale.