How do I get pixel intensity values of images stored in an array ?

I'm trying to get pixel intensity values of images stored in an array but I'm confused about how do it as i dont understand to index 3 dim variable, where testimgs is the image array.

Here is the code of the following:

adj = zeros(size(testimgs));

intensity_value = adj(698,72,i);

Answer 1

[DGM]

That would be correct, assuming that i is a real-valued integer between 1 and size(adj,3). The output will be the value at the 698th row, 72nd column, and ith page.

Of course, adj is currently all zero. Do you have a particular image that you're trying to inspect? Perhaps a volumetric image?

If you're trying to retrieve the full 3-color tuple for a pixel in an RGB image, you can do that all at once.

inpict = imread('peppers.png');

% what is the value at 100,100,1?
thispixel = inpict(100,100,1)

thispixel = uint8 66

% what is the value at 100,100,3?
thispixel = inpict(100,100,3)

thispixel = uint8 60

% or you could get the whole tuple at once
thispixel = reshape(inpict(100,100,:),1,[])

thispixel = 1×3

66 35 60