Help getting coordinates from image location..!

I get xy coordinates of green pixels from an image in a z matrix (1082x2). However, I want to extract certain coordinates from the z matrix that meet a certain location criteria.

D=imread('image.jpg');

r = D(:,:,1);

g = D(:,:,2);

b = D(:,:,3);

re = r >= 0 & r <= 60;

gr = g >= 180 & g <= 255;

bl = b >= 0 & b <= 60;

o = re & gr & bl;

[y, x] = find(o);

z=[x, y];

%Not working - Coordinate Location Criteria based on Image

width = z(:,1)>=40 & z(:,1)<=120;

height = z(:,2)>=5 & z(:,2)<=25;

o = width & height;

[b, a] = find(o);

t = [a, b]

%Overall goal is to get the designated green points in order to find the euclidean distance them and %another set of coordinates from another part of the image which I already have and input them into the code below:

X = [xvalue, yvalue ; xvalue2, yvalue2];

d = pdist(X,'euclidean')