Get pixel where the intensity is 255

Hi I have an immage 2048x2448 grayscale, I want to find all the pixel where the intensity is "255".

After i have find them i want to print this point on the immage

Answer 1

[Ameer Hamza]

img; % 2048x2448 matrix
[r, c] = find(img==255); % r and c contain all row and columns

If you want to mark these points on the image

plot(c, r, '+')

It will draw '+' marker at those locations.

[valerio auricchio]

With this code i recive the error " Assigning the function output to this

expression is not supported."

[valerio auricchio]

Ok i have solved it, but the problem is that I want to plot this point on the immage, how can i do that? Thanks a lot for the answer i will vote you

[Ameer Hamza]

Which lines caused the error? Can you share your image file and show the code which gives the error?

[valerio auricchio]

The error was solved thx, i only want to plot the point on the immage

[Ameer Hamza]

plot(c, r, '+')

will plot the points on the image. Something like this

img; % 2048x2448 matrix
[r, c] = find(img==255); % r and c contain all row and columns

imshow(img);
hold on
plot(c, r, '+')

[valerio auricchio]

thx a lot!

[Ameer Hamza]

I am glad to be of help!