ginput

filename = '2018-01-31_17-16-46.JPG';
rgb = imread(filename);
imshow(rgb);
do_input = false;
if do_input
    pause;
    pts = ginput(2);
    save data1 pts
else
    load data1
end

format shortg
pts

hold on
plot(pts(:,1),pts(:,2),'b','LineWidth',2);
plot(pts(:,1),pts(:,2),'yo','MarkerSize',9);
hold off

Warning: Image is too big to fit on screen; displaying at 25% 

pts =

       1796.9       1085.6
         2353       1063.7