How I can change the more than one pixel values in gray scale image ?

% I have gray image X (480x640 double), having values between 0 and 0 to 1, I want to change the values of all pixel to 1 that are closer to 1 and change values of all pixel to 0 that are near to 0.

[Image Analyst]

Why did you post a duplicate when you already had this: http://www.mathworks.com/matlabcentral/answers/51939-how-i-can-change-the-certain-pixel-values-in-gray-scale-image?

Answer 1

[Image Analyst]

Copying my answer from your duplicate question at http://www.mathworks.com/matlabcentral/answers/51939-how-i-can-change-the-certain-pixel-values-in-gray-scale-image:

Well, you shouldn't have accepted that answer so quickly if it didn't do what you asked. Here's how to "change the values of certain pixel to 1 that are closer to 1 and want to change values to 0 that are near to 0:

yourImage = yourImage >= 0.5;

[TURI]

Thanks " firstly, i am new to this so i didn't know how to accept answer ... but now i do, Secondly this code didn't work because it change all value either to zero or one, I need to do show both 0 and 1 but in a way that it look like an image by changing the pixel values to 1 that are near to 1 and same with 0.

[Image Analyst]

I'm not sure what you mean.

Here's an example:

yourImage = rand(3)
yourImage = yourImage >= 0.5

and in the command window.

yourImage =
         0.964888535199277         0.957166948242946         0.141886338627215
         0.157613081677548         0.485375648722841         0.421761282626275
         0.970592781760616           0.8002804688888         0.915735525189067
yourImage =
     1     1     0
     0     0     0
     1     1     1

as you can see, it changed values that are closer to 0 into 0, and values that are closer to 1 into 1, just exactly what you asked. By the way, it also works for any range of values, not just values in between 0 and 1. So, given the yourImage above, what values would you want them to be changed into?

[TURI]

Let say I have image I= [0 0 0 0.0500 0.0512 0.0473 0.0774 0.0735 0.0735 0.0774 0.0774 0.0735 0.0774 0.0735 0.0747 ] Now i wanna change all similar pixel like 0.0735 to my desire color let say red/white. please write the code with comment so i can understand. Thanks

Answer 2

[Wayne King]

The function round(), rounds to the nearest integer.

X = rand(480,640);
Xnew = round(X);