Hi everyone, I'm relatively new to both AFM and gwyddion, and my AFM is rather, well, non-standard (it's mounted on a spacecraft flying to comet 67P/Churyumov-Gerasimenko as part of the ESA Rosetta mission).
Nevertheless, I'm trying to model our tip/sample interactions with our laboratory reference model, and need the tip radius as a result. We have MikroMasch TGX01, TGZ01 and TGT01 calibration standards on-board. In any case, I'm enjoying using Gwyddion so far - it's great that a relatively specialised field as well-supported open-source application! But as a part of this process I have hit a few questions... In running a blind tip estimation: 1. What does the "Use boundaries" option do? Does this respect previously marked grain/object boundaries, or something else? For one case I only get a sensible tip image using "Run partial" with this option checked. But when I tried a full run, still checked, it looked like the calculation would take several hours if not days. 2. Following on from the last - is there anything I can do to speed up the calculation? On a 85 pixel tip image of a 512x512 (~6µm×6µm) scan of the TGT01 "spikes", for example, I have just reached 27% of the first iteration after 1 hour. 3. Many of my fits results in a rather artificial looking central peak/spike - is this simply because I'm not using enough pixels for the estimated tip size? 4. I also have access to a copy of SPIP. I believe that the same basic blind tip algorithm is used in both, and yet the results are somewhat different (also, SPIP runs the same image as in 2. in ~30 s), and I'm wondering if anyone has an explanation for this? 5. One thing that SPIP does that would be super useful (to me at least!) would be to fit a curve/sphere to the tip and derive an estimated tip radius - is that something that could be easily added? And a couple of more general questions: 6. Is there any way to overlay the pixel grid on a 3D image? I find it is useful (at least to me as a beginner!) to remind myself what the real image resolution is, and what is interpolated etc. 7. where can I see the basic image parameters (mainly number of pixels)? Thanks in advance for your help! Regards, Mark -- Mark S. Bentley ([email protected]) Institut für Weltraumforschung (IWF), Graz, Austria Phone: +43 (316) 4120-657, Fax: +43 (316) 4120-490 http://www.iwf.oeaw.ac.at/ ------------------------------------------------------------------------------ Oracle to DB2 Conversion Guide: Learn learn about native support for PL/SQL, new data types, scalar functions, improved concurrency, built-in packages, OCI, SQL*Plus, data movement tools, best practices and more. http://p.sf.net/sfu/oracle-sfdev2dev _______________________________________________ Gwyddion-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/gwyddion-users
