Trying to find out implementation of the following image

I have plotted an magnitude spectrum X(k); now i want to find the value from this image; how do i do that?

Answer 1

[Image Analyst]

You can display X and then call impixelinfo to mouse around over the image and see the values at the cursor location

imshow(X, []);
impixelinfo;

[shahriar sowad]

i want to find the value for the image that i have added with the question, not for the magnitude

[Image Analyst]

Then this will work on the actual screenshot image you added/attached with your question:

rgbImage = imread('Screenshot 2021-10-18 230205.png');
imshow(rgbImage);
impixelinfo