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Ivo. It is a case of protection. Wavelets are quite destructive without a mask, although the new Median wavelet transform tool is much better and pretty much ring free - still I would use a mask keeping other structures intact.
If you have a look at PI, you will notice that most of the native tools are wavelet based, and very effective for noise reduction and sharpening linear and non-linear images.
Not sure how that applies to ST, but wavelets are wavelets.
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