[Gwyddion-users] doubt on synthetic tool

[luis vazquez]

Hi,

I write to you because I am using the tool to generate surfaces through
the Data Process, Synthetic, Objects, and Pyramids menu of Gwyddion.
Then, when using two versions of the software the 2.42 and 2.47 and
using the same parameters in the generator (see attached file where both
screens and results are compared, the one at the left is obtained with
2.42 version and that one at the right with 2.47) the surfaces look
rather different statistically. In fact in 2.42 image there are 292
objects while in 2.47 just 73. I note that the setting in the Dimensions
label are the same in both cases (512x512 pixels and a nominal size in
both axis of 2048 microns). So, Ido not understand why so different
results are obtained.

Thanks in advance,

Luis

[David Nečas (Yeti)]

...In fact in 2.42 image there are 292 objects while in 2.47 just 73.
I note that the setting in the Dimensions label are the same in both
cases (512x512 pixels and a nominal size in both axis of 2048
microns). So, Ido not understand why so different results are
obtained.

Unforutnately, there was originally a bug in Object synthesis. The
coverage parameter did not mean what it was supposed to mean and what
the documentation sait it meant. It was corrected in 2.45:

- Object synthesis: Coverage parameter was fixed to actually mean what
the documentation describes. Multiply old values by 4 to get the same
coverage.

Regards,

Yeti

[luis vazquez]

OK, thanks, Yeti.

regards,

Luis

Post by David Nečas (Yeti)

...In fact in 2.42 image there are 292 objects while in 2.47 just 73.
I note that the setting in the Dimensions label are the same in both
cases (512x512 pixels and a nominal size in both axis of 2048
microns). So, Ido not understand why so different results are
obtained.

Unforutnately, there was originally a bug in Object synthesis. The
coverage parameter did not mean what it was supposed to mean and what
- Object synthesis: Coverage parameter was fixed to actually mean what
the documentation describes. Multiply old values by 4 to get the same
coverage.
Regards,
Yeti
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