Quoting Daniel Andrei <andrei.daniel.ste...@gmail.com>:

> Hello,
> I'm sorry if this is not the proper place to post this , but I have a
> question and I hope some of you may be able to help me, so here goes:
> I need to apply a gaussian high pass filter on a grayscale image represented
> as a pixel matrix.

Wouldn't that basically be the difference between the original image  
and a Gaussian blurred version? (i.e., duplicate the layer, set the  
layermode of the duplicate to "Difference", and Gaussian blur the  
duplicate)



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