[Nice try]

good_code.ijm

// You are a smart one
// But we did not share a solution to this code :)
// Here it is again just for you:

// You are a smart one
// But we did not share a solution to this code :)
// Here it is again just for you:

run("Set Measurements...", "area mean standard modal min limit display redirect=None decimal=3");

run("Split Channels");
selectWindow("C1-Edu+_RFP+_(2).tif");
run("Median...", "radius=5");
setAutoThreshold("Li dark");
run("Create Selection");

selectWindow("C2-Edu+_RFP+_(2).tif");
run("Restore Selection");
run("Measure");

selectWindow("C3-Edu+_RFP+_(2).tif");
run("Restore Selection");
run("Measure");