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.
> > 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
>
>
>