high-pass filter and spatial frequency

Question

Hi all,I know that the high-pass filter removes low-frequency details from an image, but I was wondering if it's possible to retrieve the cut-off frequency from the radius used and the images size (in pixels). Similarly, is it possible to retrieve the cut-off frequency of a gaussian blur filter starting from the radius used? I have been looking for this for a while now but with no result.Thank you in advance for your help!

Chuck Uebele · Answer

I'm not really sure there is a frequency that can be had. I know the process is called frequency separation, but I think that's just more a generic term for what the process does. If you do frequency separation using the method of duping a layer twice and using gaussian blur on one then apply filter/subtract on the other, all you're really doing is blurring a image by a radius of the pixel settings, then subtracting that blur from the other layer. From what I've heard, Highpass is just a not as accurate method of producing the second layer using apply image.

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