run("Close All");
input = getDirectory("/Users/ranjith.papareddy/Downloads/seed_size/onlytiffs/8bit_converted");
output = getDirectory("/Users/ranjith.papareddy/Downloads/seed_size/onlytiffs/8bit_converted");

suffix = ".tif";  //you only want to apply to tiff images, no need to ask

processFolder(input);

function processFolder(input) {
  list = getFileList(input);
  for (i = 0; i < list.length; i++) {
    if(File.isDirectory(input + list[i]))   //if it's a directory, go to subfolder
    processFolder("" + input + list[i]);
    if(endsWith(list[i], suffix))   //if it's a tiff image, process it
    processFile(input, output, list[i]);
    //if it's neither a tiff nor a directory, do nothing
  }
  }

    function processFile(input, output, file) {
    print("Processing: " + input + file);
    open(input + file);
    run("Set Scale...", "distance=0 known=0 pixel=1 unit=pixel global");
    run("Median...", "radius=3");
    setAutoThreshold("Otsu dark");
    setOption("BlackBackground", true);
    run("Convert to Mask");
    run("Analyze Particles...", "size=1950-3750 display exclude");
    saveAs("results", output + file + "_results.csv");
    print("Saved to: " + output);
    close();
    }