Measuring length of free hand lines drawn with pencil tool

Hello,

I want to measure the lengths of the lines given in the picture. These are hand drawn lines using the pencil tool. Is it somehow possible to mark them all at once and to define them as lines, so I can measure the length?

Unbenannt

Thank you for your help!!

You might want to use the following plugin for measurements:

Please read also this discussion:

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Thank you so much for your fast reply!

TPfalz, Hello!
The Ridge detection plugin will work well with this image. It also labels,and sends results files, the Directionality plugin ( under Analyze) gives a very good readout of orientation.
Bob

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I will give it a try. Thank you for your input! Much appreciated!