Normalizing a gray scale image to the range [0,1]

I'm trying to normalize a gray scale image to the range [0,1]. I tried different ways for normalizing the image, but always getting only pixels with "0" or "1", and not the values in-between.

How can I get the other values in this range?

Thanks.

Answer 1

[Azzi Abdelmalek]

a = mat2gray(yourimage)

Answer 2

[med-sweng]

I found the answer for my question here:

http://www.mathworks.com/matlabcentral/newsreader/view_thread/297402

[Youssef Khmou]

 im2double(X);

[Image Analyst]

mat2gray() scales the min to 0 and the max to 1, while im2double() divides by the max possible for that class (255 for uint8 and 65535 for uint16), so they do different things. With im2double there may not be a 0 or a 1. To do what I said in that answer you linked to, you can use mat2gray().