If a quantity named "label" is present is a cdfp file, then that value (converted t an integer) is used as the text label in the output regions file.

The cdfp file had the "label" value in each string. The original cdfp file had the line number assigned to each string in an imgcat0 file. However, for this demo I cahnge the "name" of the label value on the fourth line from "4" to "432". In the image above I have overplotted the resultant regions file, and we see the source labeled as "432".