Re: Scanning electronic magazines

Hello James,


I've got about half my articles digitized.

For monochrome 1-bit images, I've found 300 dots-per-inch is
fine--as good as an excellent fax--*except* you'll lose the occasional
subscript, superscript, or fine-print. Those items become too
pixellated to read at that resolution. 600 dpi binary images are
great, tiny details are clear.


That's pretty much my experience as well. I just don't know what an agency such as the IRS would accept for documents where the originality of a signature would not be an issue or where there is no signature. Receipts and stuff like that. Is there any official guideline?

Paperwork reduction act and all that sounds nice but only with clear guidelines will it make any sense.


100dpi 8-bit grayscale is surprisingly readable, and is what I've
stored some older magazine articles with photos in, but that's max'd
out: 'zooming' in reveals no further detail. It's much nicer to use
200+ dpi in grayscale, and then be able to zoom in and see details
clearly when things aren't so clear.

Optical character recognition (OCR): many programs work MUCH better
with 600dpi 1-bit images (e.g. Pagis Pro), though my ancient version of
PaperPort likes 300dpi fine, and recognizes more accurately than its
(former) competitor with 4x the pixels.


What really surprises me is the clarity of bitmaps imported into MS-Word docs. Clients usually want docs in that format. Yesterday I imported a pretty busy letter A size schematic in 300dpi monochrome bitmap into Word. It contains lots of non-rectangular graphics like logic gates in US standard notation. Word still shrunk the file size of that portion down to about 200k. I always print out both the CAD sheets and the document and usually cannot see a difference in quality when printed our letter size.

Regards, Joerg

http://www.analogconsultants.com
.

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