RE: Scanning old postcard for use on book cover

["Laurie Solomon" <laurie@xxxxxxxxxxxxxx>]

With respect to question 1, the answer is yes you do and you can do this
during scanning by using the scanner programs descreening feature.  If that
does not work; you can then try scanning it at an angle with the descreening
filter or try one of the blur filters in Photoshop.  With respect to
question 2, other than rotating the card during scanning with the
descreening filter in play in order to eliminate morie patterns, I would
scan it square with the scanner scanning bar and doing the rotating in
Photoshop since that would be easier when it comes to eliminating unwanted
margins or doing any other sorts of Photosop corrections or enhancements.
Respecting question 3, I woulds say do it in Photoshop and scan it in RGB
rather than grayscale or line art B&W.  After removing the yellow, then
convert it to grayscale or line art B&W depending on the content of the
card. The answer to 4 depends on too many variables to give a good answer
sight unseen.

> -----Original Message-----
> From: owner-scan@leben.com [mailto:owner-scan@leben.com]On Behalf Of
> David J. Bookbinder
> Sent: Friday, May 03, 2002 9:45 AM
> To: DigitalBW (E-mail); Scan (E-mail)
> Subject: Scanning old postcard for use on book cover
>
>
> NOTE: I'm cross-posting to the DigitalBlackandWhite and the
> Scan lists.
>
> A friend of mine has asked me to scan an old postcard she
> will be using on a
> book cover. The postcard is in black and white, on
> time-yellowed stock. It
> will be positioned at a roughly 30% angle from horizontal on
> the book cover.
> The service bureau wants a 300dpi TIFF file, and they are
> using a 150 line
> screen. I'm wondering:
>
> 1. Do I need to take into account the dot pattern of the
> postcard somehow,
> and if so, how?
> 2. Am I better off scanning the postcard at the approximate
> angle at which
> it will be printed, or rotating it in photoshop?
> 3. Am I better off trying to adjust for the yellowing in the scanning
> process, or do that later in Photoshop? And, if the latter,
> am I better off
> scanning in RGB so I can selectively remove or lighten the
> color before
> turning the image into black and white?
> 4. How much sharpening should I apply to this image before I
> hand it back to
> my friend? I normally output to inkjet printers, and they
> seem to require
> almost no sharpening, but everything I've read indicates this
> is not the
> case with press work.
>
> Sorry if these are obvious questions, but this is not
> normally what I do
> with images, so it's something of a mystery to me.
>
> TIA -
>
> More anon,
> - David
> David J. Bookbinder [david_bookbinder@sprynet.com]
>
> -
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