Thanks for the full version, Roger. But as Crispin said, it is
(re)saving a jpeg that causes degradation - not just opening it. They
are also less tolerant to disk errors because of the compression.
Horses for courses as you say but I think Nick's course is a TIFF one.
Chris Webster
Historic Environment Record
Somerset County Council
Somerset Heritage Centre
Brunel Way
Taunton
TA2 6SF
01823 347434
Online HER: www.somerset.gov.uk/her
-----Original Message-----
From: Issues related to Historic Environment Records
[mailto:[log in to unmask]] On Behalf Of THOMAS, Roger J C
Sent: 21 September 2012 11:04
To: [log in to unmask]
Subject: Re: Digitisation Project
Dear Chris and Nick,
TIFF good, pdf bad
This is a case of horses for courses, TIFF, jpeg, and pdf formats all
have their uses, but the ultimate purpose of the files need to be
considered before use.
The TIFF file is the printing and photography industry standard and the
data is stable, but the draw back is the fact that the files sizes are
large to ensure the smooth tonal graduation and detail recorded.
jepg files are the most versitile in general use where photographs are
needed to be sent by e-mail and used in presentation, but it must be
remembered from the long term archive point of view, that the data is
not stable as the files are compressed and every time a file is opened
some of the data is lost, ultimately leading to a visual degredation of
the image and the data that it holds. In addition, when considering the
use for publication, the tonal graduation and retained detail is much
poorer than a TIFF.
pdf files are very versitile and are useful for sending out illustrated
reports etc and for e-mailing but they too are heavily compressed and
therefore should only be used for that purpose, not for archiving an
image as a record etc.
Regards,
Roger J C Thomas
Asistant Designation Adviser (West)
-----Original Message-----
From: Issues related to Historic Environment Records
[mailto:[log in to unmask]] On Behalf Of Chris Webster
Sent: 21 September 2012 10:46
To: [log in to unmask]
Subject: Re: Digitisation Project
On the contrary, I think you've got very clear advice - TIFFs good, pdf
bad (for this application).
Chris Webster
Historic Environment Record
Somerset County Council
Somerset Heritage Centre
Brunel Way
Taunton
TA2 6SF
01823 347434
Online HER: www.somerset.gov.uk/her
-----Original Message-----
From: Issues related to Historic Environment Records
[mailto:[log in to unmask]] On Behalf Of Nick Boldrini
Sent: 20 September 2012 13:01
To: [log in to unmask]
Subject: Re: Digitisation Project
Hi Folks
thanks so far - sort of.
As I kinda expected theres no definitive answer, just things to
consider, but the light of experience is illuminating
I am starting to wish that I hadn't thought this up as a project though
best wishes
Nick Boldrini
Historic Environment Record Officer
Archaeology Section
Durham County Council
Tel: 03000 267008
[log in to unmask]
-----Original Message-----
From: Issues related to Historic Environment Records
[mailto:[log in to unmask]] On Behalf Of Edmund Lee
Sent: 20 September 2012 10:11
To: [log in to unmask]
Subject: Re: Digitisation Project
Hi Nick,
I don't think it got a mention on this list in July, so, in case it's
not on your radar, have a look at the new HLF guide on digitisation at
http://www.hlf.org.uk/HowToApply/furtherresources/Pages/Thinkingaboutgoo
ddigitalpractice.aspx
This new guide accopmpanies a change in HLF funding policy which allows
creation of digital products to be the main focus for an HLF funded
project.
All good wishes
Ed
English Heritage
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