From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcelo de Moraes Serpa Subject: Re: [OT] Scanning for archiving Date: Sat, 5 Nov 2011 14:52:12 -0600 Message-ID: References: <87fwi2ux4h.fsf@Rainer.invalid> Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=00151758f34cfda75e04b102fe7b Return-path: Received: from eggs.gnu.org ([140.186.70.92]:35097) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RMnDs-0000K1-Fi for emacs-orgmode@gnu.org; Sat, 05 Nov 2011 16:52:17 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RMnDq-0006Z3-Ov for emacs-orgmode@gnu.org; Sat, 05 Nov 2011 16:52:16 -0400 Received: from mail-bw0-f41.google.com ([209.85.214.41]:41546) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RMnDq-0006Xw-HV for emacs-orgmode@gnu.org; Sat, 05 Nov 2011 16:52:14 -0400 Received: by mail-bw0-f41.google.com with SMTP id s6so3581696bka.0 for ; Sat, 05 Nov 2011 13:52:14 -0700 (PDT) In-Reply-To: <87fwi2ux4h.fsf@Rainer.invalid> List-Id: "General discussions about Org-mode." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org Sender: emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org To: Achim Gratz Cc: emacs-orgmode@gnu.org --00151758f34cfda75e04b102fe7b Content-Type: text/plain; charset=ISO-8859-1 Thanks Achim! On Sat, Nov 5, 2011 at 2:34 PM, Achim Gratz wrote: > Marcelo de Moraes Serpa writes: > > I just bought a scanner and started to scan important documents as a > > backup, and archiving them with meaningful metadata in orgmode files. > > Then a question came to mind - what dpi to use? I'm not really savvy > > when it comes to scanning or printing, and I want like a dpi that > > allows me to reprint the document at an acceptable quality later if > > necessary, but that also doesn't take that much space (600dpi pdfs > > take around 5MB). > > Fax in fine mode has about 200dpi resolution. The raw scan should be in > higher resolution (usually 2x-4x the target resolution depending on the > document quality). The file to be archived then needs to be compressed > (lossless compression is preferred, e.g. TIFF or PNG) and the bit depth > reduced (black and white, usually). When making PDF files you need to > make sure that the image data doesn't get re-coded (often into much > inferior JPEG). For documents containing (color) images it is often > preferrable to separately treat text and images. The best compression > would be achieved if the whole text was extracted via OCR, but that is > probably a lot more effort than you're willing to spend. > > > Regards, > Achim. > -- > +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+ > > Samples for the Waldorf Blofeld: > http://Synth.Stromeko.net/Downloads.html#BlofeldSamplesExtra > > > --00151758f34cfda75e04b102fe7b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Thanks Achim!

On Sat, Nov 5, 2011 at 2:34= PM, Achim Gratz <Stromeko@nexgo.de> wrote:
Marcelo de Moraes Serpa <celoserpa@gmail.com> writes:
> I just bought a scanner and started to scan important documents as a > backup, and archiving them with meaningful metadata in orgmode files.<= br> > Then a question came to mind - what dpi to use? I'm not really sav= vy
> when it comes to scanning or printing, and I want like a dpi that
> allows me to reprint the document at an acceptable quality later if > necessary, but that also doesn't take that much space (600dpi pdfs=
> take around 5MB).

Fax in fine mode has about 200dpi resolution. =A0The raw scan s= hould be in
higher resolution (usually 2x-4x the target resolution depending on the
document quality). =A0The file to be archived then needs to be compressed (lossless compression is preferred, e.g. TIFF or PNG) and the bit depth
reduced (black and white, usually). =A0When making PDF files you need to make sure that the image data doesn't get re-coded (often into much
inferior JPEG). =A0For documents containing (color) images it is often
preferrable to separately treat text and images. =A0The best compression would be achieved if the whole text was extracted via OCR, but that is
probably a lot more effort than you're willing to spend.


Regards,
Achim.
--
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+<= br>
Samples for the Waldorf Blofeld:
http://Synth.Stromeko.net/Downloads.html#BlofeldSamplesExtr= a



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