The eCognition documentation states that 8 bit data are used for Haralick texture calculations and that the grey-level co-occurence matrix is 256 X 256.  Most software I've used uses 16 or 32 grey levels (4 or 5 bit).  I would only be concerned about processing time, except that I've read a few sources saying that too many grey levels can cause poor estimates of some of the underlying statistics (see p. 17 here and this article  Does anyone know why the developers chose 8 bit?  Are there other supporting studies I don't know about?

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