[Gwyddion-users] Scales conversion (from log scale to linear scale)

[John Dodji Amouzou]

Hello,
I recorded AFM images in current sensing mode using Resiscope and PicoView
and the Z scale of the recorded images is in log scale. I would like to
convert Z scales of current and resistance images into linear scale.
How could I do that?
Thanks for your help.
With regards,
Dodji.

[David Nečas (Yeti)]

Post by John Dodji Amouzou
I recorded AFM images in current sensing mode using Resiscope and PicoView
and the Z scale of the recorded images is in log scale. I would like to
convert Z scales of current and resistance images into linear scale.
How could I do that?

Using Arithmetic

http://gwyddion.net/documentation/user-guide-en/multidata.html#data-arithmetic

with expression exp(d1) (or similar, depending on the log base) and
probably using Specify units to set the correct units explicitly.

Regards,

Yeti

[John Dodji Amouzou]

Dear Yeti,
Thanks for the answer.
Data are in log10. I have the analytical expression but do not know how to
write it in gwyddion.
Regards,
Dodji

Post by John Dodji Amouzou

Post by John Dodji Amouzou
I recorded AFM images in current sensing mode using Resiscope and

PicoView

Post by John Dodji Amouzou
and the Z scale of the recorded images is in log scale. I would like to
convert Z scales of current and resistance images into linear scale.
How could I do that?

Using Arithmetic
http://gwyddion.net/documentation/user-guide-en/multidata.html#data-arithmetic
with expression exp(d1) (or similar, depending on the log base) and
probably using Specify units to set the correct units explicitly.
Regards,
Yeti
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[David Nečas (Yeti)]

Post by John Dodji Amouzou
Data are in log10. I have the analytical expression but do not know how to
write it in gwyddion.

You enter it in the Arithmetic module. There is an entry for the
expression denoted ‘Expression’. Can you see it? I sent a link to
the user guide in the first reply. The expression syntax and list of
available functions is also described there.

Regards,

Yeti

[luis vazquez]

You have to use this expression for Iec in order to get microamperes:
10^(d1-7)

where d1 is the Iec image.

Regards,
luis

Post by David Nečas (Yeti)

Post by John Dodji Amouzou
I recorded AFM images in current sensing mode using Resiscope and PicoView
and the Z scale of the recorded images is in log scale. I would like to
convert Z scales of current and resistance images into linear scale.
How could I do that?

Using Arithmetic
http://gwyddion.net/documentation/user-guide-en/multidata.html#data-arithmetic
with expression exp(d1) (or similar, depending on the log base) and
probably using Specify units to set the correct units explicitly.
Regards,
Yeti
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