Re: Scanning question (Is destruction of old tech docs a moral crime?)

[Paul Koning via cctalk]

> On Jul 21, 2019, at 6:16 AM, Joseph S. Barrera III via cctalk 
> <cctalk@classiccmp.org> wrote:
> 
> I'd suggest that in 2019 when bits are cheap and high-quality scanners
> nearly as cheap, "crappy quality digital image" is a bit of a straw man.
> Yes, I've seen plenty of barely-readable or practically unreadable scans,
> but they were made years or decades ago.
> 
> What dpi qualifies as not "crappy"? 300dpi? 400? 600?

That's not a particularly meaningful question.  300 dpi can be adequate, 400 is 
more likely to be, 600 is plenty for just about every purpose.

But asking about adequate DPI is like asking a race car driver about adequate 
horsepower.  It's just one tiny detail among a much larger set of more relevant 
issues.

A high resolution scan with bad exposure, or insufficient dynamic range, can be 
nearly unuseable.  Post-processing scans to make them easy to read is not at 
all a simple matter, especially for old faded documents.

You can also cause trouble by a poor choice of compression methods, but 
fortunately people using scanners typically know enough to avoid JPEG and the 
like.

        paul