Adobe's explanation of these different types of
scanned PDFs can be found in
http://www.adobe.com/products/acrcapture/pdfs/aacflavors.pdf
which is an old manual, but I've yet to find
another official Adobe document describing the differences.
At 15:25 16/03/2008, you wrote:
><http://www.alliancegroup.co.uk/pdf.htm>PDF/A
>should certainly be looked at and may replace
>TIFF as the standard of choice for archiving.
>
>For scanned images though it doesn't offer
>storage space advantages over TIFF. In fact a
>typical scanned PDF/A document will be slightly
>larger than the equivalent TIFF. A scanned PDF
>(or PDF/A) document is basically a TIFF file inside a PDF wrapper.
>
>Similarly you don't get full text searching with
>scanned PDF/A documents, the scanned document is
>an image not text. You can, of course, use
>PDF/A Searchable files. This involves running
>OCR (Optical Character Recognition) software to
>read the text in the image and save it to the
>PDF/A file as a hidden text layer behind the
>image. This hidden text can then be searched and
>the scanned image displayed. Though there may be
>some OCR errors these are usually acceptable.
>The scanned image would be an exact
>representation of the original document, the
>OCRd text would not be displayed. (You can do
>exactly the same with TIFF files, and store the
>OCRd text as a TIFF Tag, however the lack of an
>agreed standard for this has limited its use).
>
>Alternatively it is possible to convert a
>scanned image to a PDF/A text file which would
>give the advantages of small size and full-text
>searchability. This would involve using OCR to
>replace the scanned image with text. The scanned
>image is not stored and so a lot of effort must
>be spent on proofreading and ensuring the text
>file is an exact representation of the original.
>Even then it may not be considered a 'true'
>representation of the original. Generally the
>time this takes (possibly several hours for each
>document) cannot be justified.
>
>If you are converting electronic documents (such
>as Word or Excel) to PDF/A these will give
>smaller files than if they had been printed and
>scanned back in, and they will be full-text searchable too.
>
>PDF/A is based on PDF release 1.4 (Acrobat 5)
>and can be viewed or searched by any software
>capable of viewing or searching PDF files.
>
>Steve Norris
>Alliance Group
><http://www.alliancegroup.co.uk>www.alliancegroup.co.uk
>
>
> -----Original Message-----
>From: The UK Records Management mailing list
>[mailto:[log in to unmask]]On
>Behalf Of Stephen Robert Macintosh
>Sent: 16 March 2008 05:18
>To: [log in to unmask]
>Subject: Re: To TIFF or not to TIFF
>
>I am surprised that no one in this string has
>mentioned PDFA. PDFA is associated with an ISO
>standard (19005) and is being widely adapted by
>a number of European agencies. It also seems to
>neatly address the storage space challenges
>associated with TIFF. Further information can be
>found at <http://www.pdfa.org/>www.pdfa.org ,
>which is the URL for the PDFA competency centre based in Berlin.
>Some advantages of a PDF/A archive over a TIFF archive are:
>ط Full-Text Search
>ط File Size
>ط Metadata
>ط Optimization
>Stephen Macintosh
>ماكينتوش ستيفن روبرت
>Specialist Recordkeeper
>Documentation and Information Section
>Dubai Municipality
>Ph 971508824677
>-----Original Message-----
>From: The UK Records Management mailing list
>[mailto:[log in to unmask]] On Behalf Of Sonya Sherman
>Sent: 15/03/2008 4:20 AM
>To: [log in to unmask]
>Subject: Re: To TIFF or not to TIFF
>Sorry, I should also have mentioned another very
>practical document (in a similar vein to PD0008)
>is Archives New Zealand's S6 Digitisation Standard.
>Which includes a handy checklist.
><http://www.archives.govt.nz/continuum/rkpublications.php>http://www.archives.govt.nz/continuum/rkpublications.php
>
>regards
>Sonya
>"Shiel, Kathleen" <[log in to unmask]> wrote:
>Dear David and colleagues,
>Thank you all for your contributions to this
>thread, I do have a much clearer understanding
>of what it is that I'm trying to achieve and am
>starting some extra reading around various file
>format as well as audit processes.
>Our scenario is that we are preparing to
>digitise 75 year records, so we must ensure that
>they are legally admissible and contain
>evidential weight, but also ensure that the text
>is still searchable and that the record can still be accessed in 75 years.
>I feel a large strategy document coming on!
>Thank you all once again, I'll continue to watch for progress in this area.
>Regards,
>Kathy Shiel
>Records Manager (Modern Records)
>Woodhorn
>Northumberland Museum, Archives & Country Park
>QEII Country Park
>Ashington
>Northumberland
>NE63 9YF
>E-mail <mailto:[log in to unmask]>[log in to unmask]
>Tel : 01670 528026
>website - Woodhorn :
><http://www.experiencewoodhorn.com/>http://www.experiencewoodhorn.com
>website - Modern Records Service:
><http://www.northumberland.gov.uk/modernrecords>http://www.northumberland.gov.uk/modernrecords
>
>website - Northumberland County Council:
><http://www.northumberland.gov.uk/>http://www.northumberland.gov.uk
>
>Our mission - to provide Northumberland with a
>world class visitor attraction and research destination.
>"Whatever the cost of our libraries, the price
>is cheap compared to that of an ignorant
>nation". (This quotation is attributed to Walter Cronkite)
>----------
>From: The UK Records Management mailing list
>[mailto:[log in to unmask]] On Behalf Of David Thomas
>Sent: 13 March 2008 22:49
>To: [log in to unmask]
>Subject: Re: To TIFF or not to TIFF
>This is slightly off-topic, but interesting.
>TIFF files have the disadvantage of being quite
>large and this can add significantly to the cost
>of storage, particularly when large volumes of
>material are being digitsed. The National
>Archives is working with Glasgow University and
>other experts to see if we can identify other
>storage formats (eg JPEG 2000 or PNG) which
>would offer similar image preservation qualities
>to TIFF but would be smaller and hence cheaper
>to store. We hope to produce a draft document
>for consultation later in the year.
>----- Original Message -----
>From: <mailto:[log in to unmask]>Tinsley, Chris
>To:
><mailto:[log in to unmask]>[log in to unmask]
>
>Sent: Thursday, March 13, 2008 7:40 AM
>Subject: Re: To TIFF or not to TIFF
>To paraphrase something else, its not the format
>its what you do with it. Provided you can show
>that a TIF file has been handled in a way that
>makes tampering, changing , deleting and other
>forms of altering unlikely the it should pass
>the BIP0008 test,its not about the format. DOC
>files, excel files, RFT files are all easy to
>alter but will pass BIP0008 if processed properly.
>
>In the end its about choosing the right format
>for the images then putting the right procedures around them.
>Chris
>
>-----Original Message-----
>From: The UK Records Management mailing list on behalf of Shiel, Kathleen
>Sent: Wed 12/03/2008 16:46
>To: [log in to unmask]
>Subject: To TIFF or not to TIFF
>Hello everyone,
>I have a digital record question for you. Is the TIF format a 'legally
>admissible' format. In other words does it comply with PD 0008 'Legal
>admissibility and evidential weight of information stored
>electronically'?
>Kind regards,
>Kathy Shiel
>Records Manager (Modern Records)
>Woodhorn
>Northumberland Museum, Archives & Country Park
>QEII Country Park
>Ashington
>Northumberland
>NE63 9YF
>E-mail [log in to unmask]
><<mailto:[log in to unmask]>mailto:[log in to unmask]>
>Tel : 01670 528026
>website - Woodhorn :
><http://www.experiencewoodhorn.com/>http://www.experiencewoodhorn.com
><http://www.experiencewoodhorn.com/>
>website - Modern Records Service:
><http://www.northumberland.gov.uk/modernrecords>http://www.northumberland.gov.uk/modernrecords
>
>website - Northumberland County Council:
><http://www.northumberland.gov.uk/>http://www.northumberland.gov.uk
><http://www.northumberland.gov.uk/>
>Our mission - to provide Northumberland with a world class visitor
>attraction and research destination.
>"Whatever the cost of our libraries, the price is cheap compared to that
>of an ignorant nation". (This quotation is attributed to Walter
>Cronkite)
>
>
>
>
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