How to save overlay independently?

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How to save overlay independently?

crayfish
Dear Users/Developers,

In the ImageJ user guide it reads:

"overlays ... do not need to be saved externally when using TIFF"

... but what if someone WANTS THEM TO? I mean to save an overlay independently from the image itself, as a small - vector! - file with possibility to put it over the same image in some later time? I could find nothing in the guide nor the Forum on saving overlays as independent files.
My problem is I have some hundred scans with specimens to be measured, in JPEG that (due to detailedness) are ~11 MB each (making up several gigabytes altogether) and, in spite of using low compression, they are 10x smaller than TIFF and still 5x smaller than ZIPped TIFF. For my goals JPEGs are perfectly OK and I want to retain the overlay with measuring lines for archival purposes, but I don't want to fill whole my HDD (or have my shelf filled with dozens of DVD-Rs) with TIFFs to this end.

Have I missed something?

Greetings,

crayfish