Built-in Wizard of Digitization

You select one or several areas and start the Wizard of Digitization. On steps 1 and 2 you select mapping region, and set the scale by setting X left, X right, Y top and Y bottom values. On steps 3 and 4 graphs are handled automatically. On step 5 you can manually add single data points and remove mistakes.

Important: Only points inside selected areas will be digitized.

On a step 1 you need to select mapping region.

Use arrows to accurately define mapping region to digitize.
It is possible to rotate mapping region.

On a step 2 set new ranges of X and Y in mapping region you selected.

Set the axis name and physical units of measurement of parameter.
Select new ranges. Then you click <Next> button, the scales will be recalculated.
Linear or logarithmic axis are supported.
Use button <Current> to set the previous plot interval.

On a step 3 select parameters to digitize data automatically.

Select direction to follow curve to digitize automatically.
Select to exclude or not border, net lines, and poor (single) points from digitization.
Input digitization step.
Select fixed step to digitize with const step.
If one point on step is selected, only one curve of several parallel curves will be digitized.

On a step 4 select pixel colors to digitize data automatically.

First of all you need to add colors in list. To do it, move mouse cursor on the picture, select data point you want to digitize, and push key <C>. Then select colors 'checked' and click <Digitize> button.

Then you click <Next> button, the graphs will be processed.
Use button <Digitize> to preview.
Use 'cursor position zoom' to add colors accurately.

On a step 5 you can remove mistakes, and add single data points manually.

Move mouse cursor on the digitized point. To remove point push key <Delete>. To add point push key <Insert>.

Use 'cursor position zoom'.
Then you click <Remove All Points> button, all points added on step 4 (automatically) and 5 will be removed.
Then you click <Remove Points Added> button, only points added on step 5 (manually) will be removed.

On a step 6 data are prepared, a new series of points will be built.

Set a title of a series.
Assign a color, marker, radius (X) and aspect ratio (Y/X) for new points series.
Use button <Add Series> to create new series of points.
Use button <Picture> to Show/Hide background picture.

Trick: Repeat steps (4-5-6), on step 4 select next color, and use button <Add Series> to digitize the graph with new color, and to add next series of points.

See example.