On Wed, Aug 20, 2008 at 04:31:04PM +0900, Martin SETVIN wrote:
> When the lines does not match each other, I usually convolve
> the picture by 1-D Gaussian in direction perpendicular to scanning area.
> It is quite effective against non-matching lines and it does not hurt
> the picture too much. However, am not sure if this function is included
> in Gwyddion.

It is not included directly but you can create such a filter with Data
Process -> Integral Transforms -> Convolution Filter (and save it as a
preset for easier reuse).  I doubt this is a sound approach to row
levelling though.

Yeti


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