This tutorial shows the required steps to digitize the background picture
Select menu item
<Data><Add from picture>.
The 'Digitize background picture' dialog appears.
On step 1 select item 'Calibration points'.
On step 2 add points (0,0) and (6000,12000). To add points move mouse cursor and use key 'Insert'.
On step 3 input the coordinates of calibration points. The scale of plot will change.
On step 4 select parameters to find points automatically.
On step 5 check colors and click
Digitize
On step 6 you can add or remove points by hand. Move mouse cursor and use key
Insert
.
Then you close the dialog, new series of points appears on left panel.
To remove bad points, select menu item
<Edit><Points editor><Erase points>
.
