Import to import a file or run
engauge <Name-Of-The-File> from the command line.
Background Toolbar (top left) change the option from
Filtered image to
Depending on how many curves you wish to digitize from the graph, go to
Curve List…. From there you can add, remove and rename the separate curves.
The names of the curves should correspond to the names of the actual curves drawn.
The way the curves are formed ( connected from one point to another) varies and can be smooth, which is the default, or straight.
To change that go to
Curve Properties... ->
Connect as and choose
Function - Straight.
Axis Point Tool from the toolbar. You need to set 3 axis points.
The first one will be the start of the graph (bottom left corner) which usually corresponds to (0,0), but not always.
The second point should on the X-axis line, but not too close to the first point (0,0) because of the error introduced by hand pointing can affect the results. It should be as far away so the error does not matter that much.
The third and last point will be on the Y-axis. Again it should follow the same guidelines as the second point.
To start digitizing a curve select
Curve Point Tool from the toolbar, select the curve from the
Currently selected curve zoom in and start clicking on top of the curve from the start until the end. If you have to do it for more than one curves, change the curve selection and repeat. Also, the settings of step 4 have to be repeated for each line if needed.
After the completion, save the file by going to
Save… and if you wish to export it as a CSV file go to
Export…. Choose a name that provides information about the graph.