On Fri, 11 Oct 2002 19:28:39 -0700 George Hartzell ([EMAIL PROTECTED]) wrote:
> I think that it can make a big difference between whether you degrade > the frequency of the image before/while it's scanned (e.g. defocusing > the scanner) or whether you try to blur in photoshop. > > When you do it as part of the scan, you just have to throw away enough > information to get within the Nyquist limit. Yes, I agree. Trying to deal with an aliased scan is far worse: the errors are 0.5x the frequency of the optical signal which caused them,so much larger. Moreover colour aliasing has introduced a whole new class of problems which simply don't exist if you defocus/filter the optical image upstream. Regards Tony Sleep - http://www.halftone.co.uk Online portfolio & exhibit + film scanner info & comparisons ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body
