On Thu, Jul 26, 2012 at 02:32:27PM -0700, Julian Chavez wrote:
> I was using an imaging program by Pacific Nanotechnology called
> NanoRule which has it's own leveling capabilities. I was wondering if
> Gwyddion can perform the same functions as it does. Can it perform 3rd
> order polynomial leveling and line by line horizontal (or vertical)
> leveling?
You mean this
http://gwyddion.net/documentation/user-guide-en/leveling-and-background.html#polynomial-level
and this
http://gwyddion.net/documentation/user-guide-en/tools.html#tool-polynom
?
> This is an image of the leveling capabilities in
> NanoRule:
>
> http://i47.tinypic.com/n1xus6.png
And this is the list of levelling capabilities in Gwyddion:
Tool: Three Point Level
Tool: Path Level
Tool: Polynomial Level
Data Process → Level → Facet Level
Data Process → Level → Fit Sphere
Data Process → Level → Plane Level
Data Process → Level → Level Rotate
Data Process → Level → Fix Zero
Data Process → Level → Zero Mean Value
Data Process → Grains → Level Grains
Data Process → Level → Median Level
Data Process → Level → Polynomial Background
Data Process → Level → Revolve Arc
Data Process → Correct Data → Remove Data Under Mask
Data Process → Correct Data → Modus Line Correction
Data Process → Correct Data → Median Line Correction
Data Process → Correct Data → Median Difference Line Correction
Data Process → Correct Data → Match Line Correction
Data Process → Correct Data → Step Line Correction
> Also, after leveling it in NanoRule, exporting the leveled data (in
> .pni format), and opening that data in Gwyddion, heights are not as
> they are shown in NanoRule (maximum ~2.1nm, minimum data value is
> zeroed, gets changed to 3.9um, no longer zeroed). Could there a
> reason why the data becomes modified in this manner?
Well, everything has some reason... Is the difference between maximum
and minimum data value the same in NanoRule and Gwyddion? If it is then
it is an import bug in Gwyddion. If it is not then levelling in
NanoRule does not physically shift the values to have zero minimum; it
just changes the visualisation. Use Fix Zero in Gwyddion.
Yeti
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