Wolf said:
1440K is OK if you use plain text, but I'm always amazed at how large
PDFs can be. Eg, a two-page (!) "Inspection report" I received recently
was scanned into a PDF and came to just over 1500KB.
There are ways to fix that, depending on the situation.
Acrobat Distiller, has compression options, which require intelligent adjustment.
The default is seldom what you want. For example, the tech writers who prepare
manuals for home routers, use lossy compression for pictures of the dialog
boxes, which make the boxes totally unreadable (they leave re-sampling enabled
and use things like JPEG compression). A quick check on what the prefs are set to,
can fix that.
With regard to scanned docs, you can scan into Photoshop, and use the
"threshold" function, to remove scanner noise, and change the color space
to monochrome or grayscale. Then (eventually) prepare the PDF from that.
You can make much smaller docs that way.
Another Photoshop trick, for any kind of still image, is to take
two pictures, one after another. The CCD or CMOS sensor, adds "dark noise"
to the scan or photo. If you use an averaging function in Photoshop,
effectively (A+B)/2, you can remove most of that noise. In my experiments
here, averaging additional photos doesn't help that much. But averaging
two photos, can improve image quality a bit. This only applies to still images
that will look exactly the same (no "pictures from a windy day" need apply).
The camera would need a tripod or other means, to keep it absolutely
still. The scanner is pretty good, at keeping the image the same
from scan to scan. That won't necessarily make any difference to
the document size, but can make a cheap webcam photo look... less cheap.
Paul