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Jörg Sachse
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Hochzeit Annika & Roman

Nachdem inzwischen unser Paar seine Bilder hat, ist es mir eine große Freude, die Hochzeitsfotos von Annika und Roman endlich auch veröffentlichen zu dürfen. Die beiden haben sich im Standesamt in Radebeul trauen lassen und hatten danach eine traumhafte…
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Rechtzeitig vor dem Ende der aktuellen Spielzeit von “Der Kaktus” (eine bestechende Trämodie von Juli Zeh) der studentischen Theatergruppe Bühnamit habe ich, Resturlaub sei Dank, die Fotos von der Aufführung im Theaterhaus Rudi fertig bearbeitet, so dass…
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Der Robert von http://foto.blockschubser.de und ich waren bei der DeDeCo 2017 Cosplay-Convention. Fotos und Eindrücke gibt's hier!

Vor zwei Wochen (17.02. – 19.02.2017) fand im Dresdener St.-Benno-Gymnasium die Cosplay-Convention DeDeCo2017 statt. Drei Tage lang trafen sich Cosplayer aus der vornehmlich deutschen Szene, aber auch ein paar internationale Gäste waren dabei. Die…
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Rechtzeitig vor der Premiere des neuen Stückes “Der Kaktus”, das am 24.02. im Dresdener Projekttheater startet, möchte ich nun die Fotos vom Stück der vergangenen Spielsaison “Rote Linien” veröffentlichen. Darin entzweit der Bau einer Therme in einem…
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We have successfully repaired over 107.000 #TIFF images and blogged about it. Read the preliminary report!
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My collegue Yvonne from TIB has posted a blog entry about #TIFF validation tools:

http://openpreservation.org/blog/2017/01/17/tiff-format-validation-easy-peasy/


In general it is very useful overview, but I have some additional comments to it:

First, the tool #checkit_tiff was developed with a different philosophy in mind. Instead to validate any TIFF file against any TIFF specification, we wanted to validate a TIFF file against our predefined ruleset of a baseline TIFF with extensions. This is important, because we do not need to parse the result output to check if the TIFF file fits our needs, we need only to define a rule set and to check the exit-code. Checkit_tiff was developed as a CLI because it must be integrated in our automatic preservation workflow. This is also the reason why it is coded in plain C.

Second, Yvonne writes, that the report messages of other tools are more helpful. That was true for the checkit_tiff release some days ago. The checkit_tiff is more descriptive now, please check the GIT repository at

https://github.com/SLUB-digitalpreservation/checkit_tiff

Then we should think again about validation: the problem in validation is not to create a validator, technically. It is the problem to:

a) understand specifications
b) fileformat in detail
c) the differences between files in the wild
d) develop minimal testcase examples (e.g.: https://github.com/SLUB-digitalpreservation/checkit_tiff/tree/master/tiffs_should_fail/)

Also, you could not say with certainity “it is valid”. It depends from your knowledge and expectations. E.g. is a TIFF valid, if the ICC is wrong? Is a TIFF valid if tags are contradictory? What if some points of specifications are fuzzy?

Ange Albertini has collected some counter-examples of files which are valid and obscure at same time, please check his lecture: https://media.ccc.de/v/31c3_-_5930_-_en_-_saal_6_-_201412291400_-_funky_file_formats_-_ange_albertini (slides at: https://events.ccc.de/congress/2014/Fahrplan/system/attachments/2562/original/Funky_File_Formats.pdf)

Last, but not least, in my opinion, for an average user the DPFManager is a good choice. For an automatic workflow I would suggest checkit_tiff.
The checkit_tiff is free available and should be very portable (and can be even crosscompiled). There exists no windows version, because we use the tool under linux, only. Anyway, it is open source, send me a patch! (At the moment, a Windows version needs some rewrites in memory allocation. That is all) 😉
Thanks to Yvonne and Michele for their work, great job!

#lza #digitalpreservation
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Die schlechten ins Kröpfchen, die guten ins Töpfchen
Quelle: Wikisource , public domain Diese Woche wurde die Bitte an uns herangetragen, uns zu überlegen, wie wir mit invaliden Dateien umgehen, für die wir im Rahmen einer Dienstleistung die Langzeitarchivierung anbieten. Die Frage kam auf, weil mit dem Diens...
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