hi all
i am planning to conduct a research for my college, is it possible to use inkscape for measuring lenght, area, or perimeter of an object (cell or tissue) on an image? by using Draw bezier curve tool then measure the path lenght ? how about the accuracy and precision ? or by using trace bitmap? how to
of course i will need an object on image as reference for scale

thank you for all your help
i'm sorry for my bad English

awan

I am doing something similar with a project at university. However I have decided not to use Inkscape, mainly because of issues about how easy it is to scale objects - great for art, not so good for precise microscope measurements...

Method in Inkscape: Inkscape does have an extension to measure the length of paths (Extensions -> Visualise Path -> Measure)

Outside of Inkscape (and what I currently use for my measurments) is a tool called ImageJ. (How to measure lines in it, also the documentation of the analyse menu may be helpful).
Note that this has the one disadvantage when it comes to marking what you have already measured and annotating your images

thank you tomh

the extension will provide more and more accurate measurements of the path as you increase the number of nodes, to desired resolution of measurement. select the path, select node tool, which shows existing nodes. do select all, and that highlights all nodes. click on the add node tool repeatedly until enough nodes are added between all nodes to produce desired resolution for measurement. use the measurement extension.
a quick test shows that as you increase the number of nodes, the measurement goes up...which makes sense if the measurement tool uses simple pythagoras math to calculate vector distance between each node.