Measurement Tool and Start Annuli Count elsewhere

[droglenc]

Consider making a tool that will show an actual measurement to a point. And then consider making it so that the annuli counting starts at other than the first mark.

See this ... "We age only continental growth in eel, as its essentially impossible to age the period of time from the centre of the otolith to the first annulus while the juvenile is at sea. In our work, the distance from the centre of the otolith to the “zero band” (the band laid down when an elver moved from sea to freshwater) is generally accepted as being approximately 172 microns (give-or-take). We use a measure tool in ImagePro to identify and mark this zero band before applying other annuli. The annuli from there onwards would be years 1, 2, 3 etc. Is it possible to include a measurement tool in RFishBC to measure from otolith centre outwards in order to identify the zero band? Then have subsequent annuli counted as 1, 2, 3 etc."

[droglenc]

Possibly put a faint circle on the image at the given measurement and the let the user select a point near (or on) that circle as they see fit. The increment measurements could then just start at that point.