This is probably one of the most useful utilities in Antenna Magus. It started as an in-house application used by the engineers to read off design values from scanned graphs (mostly from published papers that were only available in *.pdf or in hardcopy). After showing this to other engineers and seeing their excitement we decided to include this as a utility in Antenna Magus.
Simply select your scanned graph image, specify anchor values and follow the trace(s) with your mouse. Apply the spline or linear function and export the XY values to a TSV (tab separated values) file. It supports both polar and cartesian graphs.
Watch the movie below to see how nicely it works.