error using fread

hye..i have a problem when run coding in matlab. it will give output like this

??? Error using ==> fread Invalid file identifier. Use fopen to generate a valid file identifier.

the fid value is -1.

i'm doing a final year project about image steganography. the problem is, when i use an image named 'baboon' with dimension 512x512, it run successfully. but when i use image named 'baboon1' with the same dimension and image, it will give error.

could anyone please tell me why?

[Jan]

It is recommended to post the code, which causes the error. The size of the image is not helpful.

Answer 1

[Image Analyst]

What do you mean by " use"? Did you read in (or try to read in) either one of both images using imread()? Or did you try to use fread() for some reason?

Answer 2

[Walter Roberson]

You are not testing the result of fopen() in order to determine whether the open succeeded or not. fid of -1 means that the open failed. The second output from fopen() will tell you the reason why.