Gwyddion – Free SPM (AFM, SNOM/NSOM, STM, MFM, …) data analysis software

GIMP plug-in replacements

Several of Gwyddion data synthesis modules reimplement – usually better – ideas from old GIMP ‘Render’ plug-ins written or improved by Yeti about than 15 years ago: FourierCompose, ParticleDeposition, PerlinNoise, Plasma2, TuringPattern, Voronoi, WavesOfChaos or WaterSurface.

The GIMP plug-ins have not been updated since, mostly because Gwyddion's direct data arrays are a better match for generation of 2D maps that involve FFT or solving differential equations than GIMP's tile-based system. In addition, false colour mapping comes free in Gwyddion and is non-destructive. On the other hand, some useful operations that quite natural in GIMP, in particular mapping RGB channels to three different functions, may be cumbersome in Gwyddion because it does not work with colour images – it works with height maps. So one has to generate the three channels in sequence and compose them as RGB ex post.

Anyway, there is essentially zero chance of further development of the GIMP plug-ins. But people still ask about them occasionally. Here is an overview of full or partial replacements of the GIMP render plug-ins by Gwyddion data synthesis modules. All images on this page were generated in Gwyddion.

FourierCompose

Gwyddion's Spectral synthesis module is more or less a direct equivalent of the GIMP FourierCompose plug-in. Both generate images with given density of spatial frequencies (and random phases) with using inverse Fourier transform.

There is a second module that employs Fourier synthesis, Phases. However, it mostly uses FFT as a dirty trick to approximate images that could take weeks to obtain if simulated properly. So they output is quite different from FourierCompose.

ParticleDeposition

Columnar synthesis in Gwyddion is essentially exactly the same model of columnar film growth as the GIMP ParticleDeposition plug-in. Even some of the parameters are (roughly) equivalent, although the naming has changed.

But there is more. Gwyddion has several additional modules that simulate some deposition process (in fact, there seems to be no end of them): Ballistic and Diffusion represent classical physical models, ballistic deposition and diffusion-limited aggregation. Arguably, Object, Fibre and Particle data synthesis modules are also particle deposition models.

PerlinNoise

There is no Gwyddion module that reimplements the same algorithm as GIMP PerlinNoise plug-in. That being said, Spectral synthesis with Gaussian multiplier enabled generates surfaces that are sufficiently similar that no specific replacement is necessary.

Plasma2

There are essentially two replacements for the probably most popular GIMP plug-in from the set, Plasma2. Again, Gwyddion's Spectral can generate a variety of images from the same class – in particular the fractal-like images can be even completely mathematically equivalent.

The second Gwyddion module is much closer to the original algorithm used in Plasma2, becaust it also works by spatial subdivision. Although Brownian has a somewhat different set of options, if you want Plasma2-like images generated with some heavy-tailed distributions, it certainly can do that.

TuringPattern

GIMP TuringPattern plug-in has also two successor modules in Gwyddion, albeit rather removed. Domains simulates the characteristic spirals and other shapes produced by non-equilibrium Ising models. The images it can calculate are neither a subset nor a superset of TuringPattern's, but there is a considerable intersection.

The already mentioned Phases module essentially generates one specific type of pattern that TuringPattern did. The physical system motivating its creation was different, but the resulting patterns are similar.

Voronoi

If you like the GIMP Voronoi plug-in you must love the Lattice module in Gwyddion. It implements the same surface construction, but it has much more flexibility and interesting options. It does not do one thing the GIMP plug-in does, generation of tileable images (the plug-in was cheating in a sense).

WavesOfChaos

The WavesOfChaos GIMP plug-in currently does not have any replacement or successor in Gwyddion. Stay tuned.

WaterSurface

GIMP WaterSurface plug-in was originally created by Kyoichiro Suda and Yeti only did some improvements and rewrites. Anyway, it was also reimplemented in Gwyddion as Waves. It is not a drop-in replacement but you can recognise a number of identical parameters between the GIMP plug-in and the Gwyddion module.

Transferring images

Now the most important point, especially if you are not faimilar with Gwyddion. How to get an image from Gwyddion to GIMP:

You can do post-processing in GIMP, but Gwyddion also offers a bunch of interesting (and sometimes complementary) functions. You may want to save the data as a GWY file to preserve it as double-precision data that can be processed or colour-mapped differently later.

1.8 (yeti, 2017-07-10 12:36:49)
© David Nečas and Petr Klapetek

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