Hi, how can i scale the image data to 0 and 1

i am working on greyscale images, i have to scale the data between 0 and 1, and but dividing the image data on 255 gives only 0 or 1, how can i get the actual vale after division.

Answer 1

[Jan]

If you divide an uint8, you get an uint8. Therefore either convert the matrix to double at first:

gray_d = double(gray) / 255;

But for productive work and if you have the image processing toolbox, use Thorsten's suggestion. im2double checks the type of the input and considers, if the input is a uint16 or double already.

Answer 2

[Thorsten]

Use

im2double

[Jan]

+1. This is the best solution.