Re: [Gimp-user] Fw: scan-mirrage-effect-Problem with postcard

["Bradley S. Rosen" <brosen sportsworldchicago com>]

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Brad

On Mon, May 10, 2021, 10:23 PM Gene Heskett <gheskett 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.
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>
>
> 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>
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