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
