Digital BW, The Print

----- Original Message ----- 
From: "Anthony G. Atkielski" <anthony@...>
To: "Colin & Linda McKie"
<DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Thursday, February 19, 2004 12:22 PM
Subject: Re[2]: [Digital BW] Scanners?


Colin & Linda McKie writes:

> Anthony's statement (1) might be true in some fantasy land with
> scanners which can resolve twice the maximum possible
detail/grain
> frequency, but in the real world some careful capture
sharpening can
> compensate for the inevitable shortcomings of the scanning
process.

>No, it cannot.  No digital manipulation can increase the amount
of
information in an image--whatever the scanner produces is all you
will
ever get.  Furthermore, all sharpening algorithms produce image
degradation. Essentially, you trade real image information for an
illusion of sharpness: small details are actually destroyed in
order to
emphasize larger details, which gives a visual impression of
greater
sharpness even though the image is softened in reality.<

No sharpening can increase the amount of information in the
landscape, the film, the scan. But it certainly can rearrange the
information in the scan that it suits the original landscape or
take better. And any manupilation will rearrange or decrease the
amount of information so it is hard to say which manupilation
should be first in the row. That's what Fraser addresses in that
article, a basic sharpening that will allow further manupilations
without too much loss of information and at the end sharpening
that suits the output process. The last can also be done in
Qimage at printing stage.


>No, "practical technology" cannot violate the rules of
information
theory. There is no sharpening method that does not degrade image
quality. This reality is one of the fundamental things that every
photographer must fully understand in order to get the best out
of a
digital workflow.<

It isn't just with sharpening, there's no image manupilation
method that will not rearrange and/or degrade the information. So
the choice is which one will be first. Fraser creates different
sharpening technics for different phases in the process.
The pain is distributed. Seems a sound method. If no other
manupilation is done than both methods become one and the same.

And archiving the raw, highest resolution scan possible at 48
bits is still possible. Takes more space than film though and
will not be up to date with the latest scan hard- and software.
The real raw information is in that film or outdoors. There's no
choice in digital photography but archiving the file or make a
new pic.

Ernst



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