Making Sigillographic Material Accessible to Researchers – Digitising, Catalogues, Editions of...

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Seal Digitisation with Reflectance Transformation Imaging (RTI)Cologne Center for eHumanities | Stephan Makowski | 13.10.2016

AgendaIntroduction RTITechnical DesignExamplesByzantine SealsOther techniques (3D)Archival relevance Beyond Digitisation

Cologne Center for eHumanities | Stephan Makowski | 13.10.2016

Introduction RTITechnical DesignExamplesByzantine SealsOther techniques (3D)Archival relevance Beyond Digitisation




Introduction Reflectance Transformation Imaging (RTI)Origins from HP Labs (2001)Technique based on Polynomial Texture Mapping (PTM)Currently developed by Cultural Heritage Imaging


Introduction Reflectance Transformation Imaging (RTI)Advantages:H-RTI is a non-invasive and non-contact recording method, and therefore protects the heritage resource being recorded.Cost effectivetransportable

Source: Sarah M. Duffy: Multi-light Imaging for Heritage Applications, English Heritage, 2013, p.3.


Introduction Reflectance Transformation Imaging (RTI)Disadvantages:Quality relies on the captured imagesMax. size 2m diameterGives just information about surface; not underlying materials









Source: Sarah M. Duffy: Multi-light Imaging for Heritage Applications, English Heritage, 2013, p.6.1) Camera2) Souce of Light3) Archival Material, etc4) Light Identifier



Lightangle


To DoGet / Build EquipmentMake pictures (jpeg) from any desired lightanglesMake RTI File (ptm) with RTI Builder (free and online available)View with RTI Viewer (Software or webplugin; free and online availale)










Souce: http://culturalheritageimaging.org/Technologies/RTI/


Souce: http://culturalheritageimaging.org/Technologies/RTI/






Other techniques3D-Method:Advantage:reproduce seals with 3D-modellsinteractive modell (turnable)

Disadvantage:Slower then RTIMore expensive


Souce: 2016, Steadpro


https://sketchfab.com/models/5e96a37616854991873c0a453527e743https://sketchfab.com/models/eabf12338dba42aea69b388eae80e305Examples






Archival RelevancePreservation:Seals dont have to be shown to the audienceMaking RTI-images doesnt harm the seals (light, heat, etc.)

Audience:Attract scientifics and others to work with online available images






Beyond DigitisationEncoding of Seals in Digital HumanitiesDescription of SealsMetadataUsable and Searchable for others!

SigiDoc (derived from EpiDoc)


Thank you very much!Stephan Makowski, [email protected]: +49-221-470-4052http://www.cceh.uni-koeln.deLinks:http://culturalheritageimaging.org/Technologies/RTI/

Software:http://culturalheritageimaging.org/What_We_Offer/Downloads/


www.steadpro.com

Making Sigillographic Material Accessible to Researchers – Digitising, Catalogues, Editions of...

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Transcript of Making Sigillographic Material Accessible to Researchers – Digitising, Catalogues, Editions of...