LabPlot/CurveTracing

Datapicker is a tool that allows to easily extract data from image files. The process of extraction consists mainly out of the following steps:

Import an image containing plots and curves where you want to read the data points from
Select the plot type (cartesian, polar, etc)
Select tree reference points and provide values for them. With the help of these points the logical coordinate system is determined
Create a new datapicker curve and set the type of the error bars.
Switch to the mouse mode "Set Curve Points" and start selecting points on the imported image - the coordinates for the selected points are determined and added to the spreadsheet "Data".