problem with saving image with imwrite!

My code:

load ('cl.dat')
c=reshape(cl,106,14)
ct=transpose(c)
imagesc(ct)
imwrite(ct,'f8.jpg','jpg')

I just want to save the image but it does not work,where is the problem?

Answer 1

[Image Analyst]

"where is the problem?" - I was going to ask you the same thing. What does "it does not work" mean? Do you have an error message? Are you sure ct is uint8? What does

whos ct

report back?

[Image Analyst]

OK, it's double. Try casting to uint8:

ctUint8 = uint8(mat2gray(ct));

and save that instead of ct.

[Milenko]

Thanks,it works but this is not exactly what I want.

ctUint8 = uint8(mat2gray(ct));
imagesc(ctUint8)
imwrite(ctUint8,'f8.jpg','jpg')

In ct I have numerical values from 1-8,so I want to represent clusters,image in a way that for one cluster I have one colour.

[Image Analyst]

mat2gray scales to 0-1 so you might need to use

ctUint8 = uint8(255*mat2gray(ct));

if you want it to look bright with a normal gray scale colormap.

Posting an image would help. I don't know what "clusters" means to you. Do you want to do image classification?

[Milenko]

yes,exactly i want image classification.

Answer 2

[Milenko]

>> whos ct Name Size Bytes Class Attributes

ct        14x106            11872  double