[softwarelist] Re: Halftone scanning
- From: John Harrison <john@xxxxxxxxxxxxxxxx>
- To: davidpilling@xxxxxxxxxxxxx
- Date: Tue, 27 Nov 2007 20:49:35 +0000 (GMT)
> A halftone b/w picture that I am trying to scan (DPlngScan 1.24) ends
> up with a mottled appearance.
I've had this problem, and usually manage to get a reasonable result using
the processing in DPlngScan (median or average, I forget which) sometimes
applied twice. It loses resolution (but it's arguable whether the picture
information, as opposed to the quantisation noise, had that much anyway).
I recall having to fiddle with the scanner resolution as well to get the
best results - probably to avoid any low spatial frequency fringing.
The cases where I have failed have been very small images where the whole
picture was no more than 100 pixels wide.
John
--
John Harrison - http://www.jaharrison.me.uk
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