Curve segment for datapicker can be created over image by switching mode to Select Curve Segments in the context menu of datapicker. A segment is a selectable object over image which can be selected by mouse right click over it.

Segments are created by processing of image on the basis range of colour attributes in order to automatically trace curves. To improve results these range and types of colour attributes can be changed in the "edit" section of dock-widget. Dock-widget also provides options to switch among processed image and original image, and to set the minimum possible length of segments.

Once a segment is selected it will create curve points over it with a minimum specified distance among them. The minimum specified distance among the points can be changed in the dock widget of datapicker. User might have to select the segments again in order to observe the changes.