Select Polygon Areas

Use Edit Polygon to select irregular polygon areas in an image file. This allows you to:

Select data for 3D models or volume projections.
Copy selected data to another file.
Get statistics for selected areas.

Edit polygon provides tools that you can use:

To copy polygons

To define guide options

To clear selected polygons

Note You may find that the calculated value for a polygon's area is overestimated. Basically, the polygon area calculation is performed as:

[number pixels enclosed] x [pixel size X] x [pixel size Y] = area in square microns.

When you are measuring a selected area, all of the pixels that the polygon boundary crosses are included in the calculation. You can therefore end up with a somewhat larger area measurement than expected. This overestimate is substantial for small polygons that include only a few pixels, but decreases significantly for larger polygons.