ROIsRings_DistanceMap.ijm

run("Close All");
roiManager("reset");
// ring thickness
step = 10 ;

// prepare a test image 
setForegroundColor(255, 255, 255);
setBackgroundColor(0, 0, 0);
newImage("Shape", "8-bit black", 512, 512, 1);
makePolygon(258,122,171,192,115,272,167,430,232,350,229,302,289,338,324,300,329,236,411,160);
run("Fill", "slice");


// Make distance map 
run("Select All");
run("Duplicate...", "title=dMap");
//run("Invert");
run("Distance Map");
// and iterate to create ROIs
for (i = 0; i < 10; i++) {
	selectWindow("dMap");
	setThreshold(i*step+1, i*step+step);
	run("Create Selection");
	roiManager("Add");
}

//Show ROIs on the initial image
selectWindow("Shape");
roiManager("Show All");