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On Mon, May 10, 2021, 10:23 PM Gene Heskett <ghesk...@shentel.net> wrote: > On Monday 10 May 2021 20:56:27 Rick Strong wrote: > > > I didn't see my reply show up on the Gimp user list. > > RS > > -----Original Message----- > > From: Rick Strong > > Sent: Monday, May 10, 2021 11:33 AM > > To: Tim (from Hamburg) ; gimp-user-list@gnome.org > > Subject: Re: [Gimp-user] scan-mirrage-effect-Problem with postcard > > > > Well, it's not moiré from the glass. > > > > It seems to be a scanning artefact introduced by the scanner. But you > > say it doesn't happen with scans of images on plain or matte paper. > > try putting a black card over the postcard before you lower the lid. > > Also check your scanner settings. > > > > If that doesn't work, you could try photographing the glossy postcard > > with a camera. With some fridge magnets you could stick it vertically > > to the side of something metallic in good light, like your > > refrigerator or your car. Then crop out or clone out the magnets from > > the photograph. > > > > Rick S. > > The moire pattern is without a doubt, from scanning a litho print which > is microscopic patterns of different size colored dots that mix in the > eye to make the color. If the scanner or camera lens is sharp enough and > the autofocus accurate enough, it can be quite a problem. you may be > able to reduce or eliminaate it with what ever is in the toolbox to > reduce the unwanted sharpness, which should blend the dot pattern away > if done in the right amount and size of the blend. Ideally, the size of > the blend should match the size of the dot pattern but tolerances in > paper positioning as the printer lays each ink color may make this > difficult to balance without adversly effecting the overall sharpness. > > Be aware that copyright info may be hidden, invisible to the eye in this > dot pattern. And it is considered valid proof of a violation. > > _______________________________________________ > > gimp-user-list mailing list > > List address: gimp-user-list@gnome.org > > List membership: > > https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: > > https://mail.gnome.org/archives/gimp-user-list > > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/gene> > _______________________________________________ > gimp-user-list mailing list > List address: gimp-user-list@gnome.org > List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list > List archives: https://mail.gnome.org/archives/gimp-user-list > _______________________________________________ gimp-user-list mailing list List address: gimp-user-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: https://mail.gnome.org/archives/gimp-user-list
