Newsgroups: sci.image.processing
Path: cantaloupe.srv.cs.cmu.edu!das-news2.harvard.edu!news2.near.net!news.mathworks.com!udel!gatech!howland.reston.ans.net!pipex!uknet!cf-cm!thor.cf.ac.uk!wdrdsw
From: wdrdsw@thor.cf.ac.uk (David Wooding)
Subject: Adobe Photoshop
Message-ID: <1983.9411211642@thor.cf.ac.uk>
Sender: wooding@cf.ac.uk
Reply-To: wooding@cf.ac.uk
Organization: University of Wales College of Medicine
Date: Mon, 21 Nov 1994 16:42:28 GMT
X-Mailer: Cardiff Computing Maths PP Mail Open News Gateway
Lines: 23


Hello.

I need to find out a little of the inner workings of the High Pass filter 
in the Adobe photoshop package. Namely, when you input a radius in 
pixels, what does this radius refer to? The text just says it determines 
how much of the high frequency information is retained and how much of 
the low frequency information is suppressed - a low value suppresses most 
low frequency info, and you end up with a very high frequency version. A 
quick drawing of the mask it is using would be useful, since the 
alternative to this algorithm is to use the custom filter to design your 
own high-pass mask. I have used the built-in high pass filter in the past 
and need to know exactly what I was using....

Thanks,

Dave.

-- 
Dr.David Wooding (wooding@cardiff.ac.uk)  UWCM, Cardiff, Wales, UK
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