For comparing roughness of different surfaces, I used Gwyddion for post processed of data files retrieved from AFM. To make the Z scale the same:
*For example, default maximum height of data is 300nm and I want to scale to 600nm.
2D images:
Icon: Tools - Stretch color range to part of data - Explicitly set fixed color range
Changing the Maximum to 600 nm
3D images:
Open data files (in 2D view default)
Icon: View - Display a 3D view of data - Show full controls
Change the "Value scale" to 0.5 (300/600)
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