title: Adding ROI outlines and labels to a grayscale stack and creating montage
body: <p>I have a grayscale image stack with ~100 slices. In selected slices, I have indicated ROIs using the freehand tool and added a label for measurement.</p>
  
  <p>What I would like to do is to generate a montage that contains the selected slices with ROIs and labels indicated as an overlay. I tried to make a substack, add the overlays from the ROI manager and then generate a montage but the montage doesn't show the overlays. I also tried the 'Flatten' command but it requires an RGB image. If I convert the grayscale image to RGB, it overlaps all the ROIs on top of the first image rather than placing them on the right slice.</p>
  
  <p>Any ideas on how I can do this?</p>
  
  <p>Thanks!</p>