Hi Daniil, Thank you a lot for your helpful suggestions! To obtain the intersect of two masks I used Data Process-> Mark with-> Intersect masks. Is the result would be the same if I'd have used multidata arithmetic as you suggested?
And also when I use Statistical quantities for marked region it gives me Surface area and Projected area. Do you know what is the difference between those two and why the surface area is N.A. for magnetic images (NapPhaseRetrace)? Thank you! Be well, Evgeniya Khakhalova. On Tue, Jun 2, 2015 at 2:25 PM, Daniil Bratashov <[email protected]> wrote: > On Tue, 2 Jun 2015 13:38:35 -0500 > Evgeniya Khakhalova <[email protected]> wrote: > > > Is there any ways that I can calculate average background noise > > (areas outside the grain) and then use it as a threshold value to > > mask dark/light regions inside the grain and then calculate the > > surface areas of those regions only inside the grain? > > The main idea is to select region of interest by mask (by > marking grain by height threshold on height image), than to transfer > mask from height image to magnetic, and than use statistics tool on > region under/not under the mask to measure average background noise. > > Than you can use threshold on magnetic image, and than use multidata > arithmetic on both masks to get intersection of two masks. > > > 2. If it is actually possible to use crop function for some arbitrary > > shapes like on the example? > > Crop is not intended for such applications, better to use masks. > > > 3. Can I use for example respective topography image to crop the > > magnetic image along its grain boundaries more precisely? > > Yes, by obtaining two masks and then use multidata arithmetic. > > I suppose this two links will be helpful: > http://gwyddion.net/documentation/user-guide-ru/presentations-masks.html > http://gwyddion.net/documentation/user-guide-ru/multidata.html > > WBR, Daniil Bratashov. > > > ------------------------------------------------------------------------------ > _______________________________________________ > Gwyddion-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/gwyddion-users >
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