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Unfortunately there isn't really much documentation beyond what you see there. If you do a google search you may be able to find a couple more examples.
Here is a brief rundown of the general effects I've seen from each function. Maybe petopeto could fill in some missing technical details.
Strength = a.k.a. Amplitude, high values for more blurring (Use Normal view for tweaking)
Contour = high values for a sharper image (Use Normal view for tweaking)
Anisotropy = high values for a sharper image, different and less intense then Contour (Use Normal view for tweaking)
Noise Scale = Since it's called alpha, I assume it is for determining the alpha threshold to be considered noise. Higher values will blur more noise and kill more detail (Use Structure Tensor view for tweaking)
Geometry regularity = high values will blur more, usually the difference is minor. (Use Normal view for tweaking)
Initial Gaussian Blur = regular Gaussian Blur preformed before other filtering, and will obviously blur the whole image indiscriminately. (Use Initial Gaussian Blur and Structure Tensor view for tweaking)
Iterations = How many times is the filtering applied. There usually isn't a big difference between say Strength 60|Iterations 2 & Strength 120|Iterations 1. (Use Normal view for tweaking)
Gfact = Main tool for creating the edge/detail mask to be excluded from filtering. Higher values may need Noise Scale and/or Initial Gaussian Blur to help remove unwanted noise from the mask. Optimally aim for blue/red lines to cover all your edges and green everywhere where you want to keep detail. If, like petopeto, you don't care about excluding your edges and detail from filtering, stick with the default or other low Gfact value. (Use Structure Tensor view for tweaking)
Spacial Step = Higher values for more detail (Use Normal view for tweaking)
Angular Step = Lower values for less contrast? I haven't found this value particularly useful. (Use Normal view for tweaking)
Gauss Precession = Smaller values for more precise blurring, more detail retained. (Use Normal view for tweaking)
Interpolation = [Low quality]Nearest------Linear------Runge-Kutta[High quality] (Use Normal view for tweaking)
Fast approximation = More blurring, less detail, fast (Use Normal view for tweaking)
Alt. Amplitude = Alternative Amplitude method to reduce negative effects when using very high amplitude (strength) values. (Use Normal view for tweaking)
Cyberbeing
Here is a brief rundown of the general effects I've seen from each function. Maybe petopeto could fill in some missing technical details.
Strength = a.k.a. Amplitude, high values for more blurring (Use Normal view for tweaking)
Contour = high values for a sharper image (Use Normal view for tweaking)
Anisotropy = high values for a sharper image, different and less intense then Contour (Use Normal view for tweaking)
Noise Scale = Since it's called alpha, I assume it is for determining the alpha threshold to be considered noise. Higher values will blur more noise and kill more detail (Use Structure Tensor view for tweaking)
Geometry regularity = high values will blur more, usually the difference is minor. (Use Normal view for tweaking)
Initial Gaussian Blur = regular Gaussian Blur preformed before other filtering, and will obviously blur the whole image indiscriminately. (Use Initial Gaussian Blur and Structure Tensor view for tweaking)
Iterations = How many times is the filtering applied. There usually isn't a big difference between say Strength 60|Iterations 2 & Strength 120|Iterations 1. (Use Normal view for tweaking)
Gfact = Main tool for creating the edge/detail mask to be excluded from filtering. Higher values may need Noise Scale and/or Initial Gaussian Blur to help remove unwanted noise from the mask. Optimally aim for blue/red lines to cover all your edges and green everywhere where you want to keep detail. If, like petopeto, you don't care about excluding your edges and detail from filtering, stick with the default or other low Gfact value. (Use Structure Tensor view for tweaking)
Spacial Step = Higher values for more detail (Use Normal view for tweaking)
Angular Step = Lower values for less contrast? I haven't found this value particularly useful. (Use Normal view for tweaking)
Gauss Precession = Smaller values for more precise blurring, more detail retained. (Use Normal view for tweaking)
Interpolation =
[Low quality]Nearest------Linear------Runge-Kutta[High quality] (Use Normal view for tweaking)
Fast approximation = More blurring, less detail, fast (Use Normal view for tweaking)
Alt. Amplitude = Alternative Amplitude method to reduce negative effects when using very high amplitude (strength) values. (Use Normal view for tweaking)