ImageJ: quantify colocalization by point selection

//to import code in ImageJ: File>New>New text window>paste the following:

input = "C:/Users/Zsofi/Desktop/test2/"; //change imput dir as required
output = "C:/Users/Zsofi/Desktop/test2/"; //change output dir as required

path = getDirectory("image");
list=getFileList("C:/Users/Zsofi/Desktop/test2/"); //change imput dir as required

for (i = 0; i < list.length; i++){
        action(input, output, list[i]);
}

function action(input, output, filename) {
        open(input + filename);
        img_title = getTitle();

run("Split Channels");
selectWindow(img_title+" (blue)");
close(); //closes DAPI/blue channel
selectWindow(img_title+" (red)");
run("Find Maxima...", "prominence=100 output=[Point Selection]");  //change prominance val. based on manual checking
run("Enlarge...", "enlarge=12"); //change enlarge based on ROI size
selectWindow(img_title+" (green)");
run("Restore Selection");
run("ROI Manager...");
roiManager("Add");
roiManager("Split");
roiManager("Measure"); //gives you a brightness value in the green channel for every red dot
roiManager("Delete");
selectWindow(img_title+" (red)");
close();
selectWindow(img_title+" (green)");
close();

}