Click Measure Filter to start the analysis of a scanned filter. This process can take up to several minutes according to the number of analysed fields and the detection preset complexity. You will be informed about the progress of the analysis in the following window:

Figure 359. Analysis Progress Bar

You can pause or quit the analysis by the or buttons in the bottom right corner of the window.

If you are opening the filter image from file, it already contains all the data, which can be recalculated.