Digital image enhancement with DStretch®: Is complexity always necessary for efficiency?

DStretch, plug-infor ImageJ© is designed specifically for the enhancement of digital images of pictographs.It is now widely used in the world since a decade but have thus far rarely been used in French and African rock art studies. Among all the software tools currently available to rock art specialists, it is one of the most efficient to decipher faint paintings and sometimes engravings,while being cheap, fast and easy to use, particularly in harsh or remote environments. Moreover, the enhancement of digital images with DStretch is almost operator-independent and reproducible thanks to pre-recorded settings, thus improving objectivity. We provide several examples of the benefit of using this tool on various sites, from African prehistoric pictographs to Alpine paintings and petroglyphs,and propose a method for recording rock art panels with DStretch. But, in spite of these advantages, we have to keep in mind that the final tracings are always subjective and biased by personal perceptions,as demonstrated here by a simple but significant experience.

[1]  Jean-Loïc Le Quellec.  Perceptions et attentes dans les études d'art rupestre , 2007 .

[2]  Patrick Paillet.  L'art paléolithique : tradition et modernité , 1998 .

[3]  Jean-Loïc Le Quellec.  Datations directes et indirectes des images rupestres en Ahaggar, dans la Tasili-n-Ajjer et l’Atlas saharien , 2010 .

[4]  Ian J. McNiven,et al.  Kabadul Kula : A Rock-Art Site on Dauan Island, Torres Strait , 2004 .

[5]  Michael Paul Firnhaber.  Experiencing rock art : a phenomenological investigation of the Barrier Canyon tradition , 2008 .

[6]  R. G. Bednarik,et al.  Le cas des lions hermaphrodites , 1992 .

[7]  Livio Dobrez,et al.  Rock art, perception and the subject/object binary , 2011 .

[8]  Elisa Boche,et al.  Au coeur des premières manifestations graphiques du Paléolithique supérieur: Nouvelles découvertes dans la grotte des Bernoux (Dordogne) , 2014 .

[9]  Divaldo A. Gutiérrez Calvache,et al.  Los procedimientos de recuperación y documentación gráfica en el arte rupestre cubano: Panorama histórico , 2010 .

[10]  Phil Clogg,et al.  Digital Image Processing and the Recording of Rock Art , 2000 .

[11]  Sophia Lahlil,et al.  Crack patterns morphology of ancient Chinese wares , 2013 .

[12]  R. G. Gunn,et al.  'Interpreting' Polychrome Paintings Using DStretch , 2014 .

[13]  Tony Bennett,et al.  Memoirs of the Queensland museum. , 1996 .

[14]  Liam Michael Brady,et al.  Documenting and Analyzing Rock, Paintings from Torres Strait, NE Australia, with Digital Photography and Computer Image Enhancement , 2006 .

[15]  Christian Dupuy,et al.  [Analyses de] - F. Soleilhavoup, L'art mystérieux des Têtes Rondes au Sahara. Éditions Faton, Dijon , 2008 .

[16]  Carole Fritz,et al.  The Hidden Meaning of Forms: Methods of Recording Paleolithic Parietal Art , 2007 .

[17]  Robert Layton,et al.  Intersubjectivity and understanding rock art , 2000 .

[18]  David A. Richards,et al.  Quaternary Geochronology (5) , 2010 .

[19]  Jean Clottes,et al.  LE SANCTUAIRE SECRET DES BISONS. IL Y A 14 000 ANS, DANS LA CAVERNE DU TUC D'AUDOUBERT, BY ROBERT BÉGOUËN, CAROLE , 2009 .

[20]  Agustín Acevedo,et al.  Aplicación de DStretch-ImageJ a imágenes digitales del arte rupestre de Patagonia (Argentina). , 2012 .

[21]  Cliff Ogleby,et al.  A METHOD TO VISUALLY RATIONALISE SUPERIMPOSED PIGMENT MOTIFS , 2010 .

[22]  José Pereira,et al.  The colours of rock art. Analysis of colour recording and communication systems in rock art research , 2014 .

[23]  Jeremy C. Hollmann,et al.  Digital imaging and the revelation of 'hidden' rock art : Vaalekop Shelter, KwaZulu-Natal , 2011 .

[24]  Guillaume Robin.  L’arte parietale dell’ipogeo di Chercos , 2010 .

[25]  Gérard Labrot,et al.  L'œuvre d'art et ses significations , 1970, Annales. Histoire, Sciences Sociales.

[26]  N. Aujoulat,et al.  Le relevé des oeuvres pariétales paléolithiques. Enregistrement et traitement des données. , 1987 .

[27]  J. García,et al.  Técnicas digitales para la elaboración de calcos de arte rupestre , 1998 .

[28]  Liam Michael Brady,et al.  A different look: comparative rock-art recording from the Torres Strait using computer enhancement techniques , 2007 .

[29]  James Dodd.  Petroglyphs as Paintings The application of digital image enhancement to the study of Årsand 1, Hordaland, Western Norway , 2013 .

[30]  Michael P. Rainsbury,et al.  The spiral that vanished: the application of non-contact recording techniques to an elusive rock art motif at Castlerigg stone circle in Cumbria , 2006 .

[31]  L. De Cola.  L'ostentazione della virilità : I risultati combinati della Pulizia Elettronica (P.E.) e del rilievo tradizionale applicati a un dipinto di Sefar , 1999 .

[32]  Bryn Barabas Potter.  Handbook of the Kawaiisu , 2014 .

[33]  Thembi Russell,et al.  The Application of the Harris Matrix to San Rock Art at Main Caves North, Kwazulu-Natal , 2000 .

[34]  Liliana Spanedda,et al.  Abrigo con arte rupestre de El Tablazo II (Diezma, Granada): Revisión con DStretch de los motivos pintados , 2013 .

[35]  Gérard Lachaud.  Les guerriers de Tazega Mellet (Tassili-n-Azjer) , 2008 .

[36]  Yolanda Seoane Veiga.  Propuesta Metodológica para el Registro del Arte Rupestre de Galicia , 2009 .

[37]  Christian Dupuy,et al.  Les peintures rupestres de l'abri de Tin Taharin (Tassili Edjerit, Algérie) , 2007 .

[38]  J. M. Moore,et al.  Direct decorrelation stretch technique for RGB colour composition , 1996 .

[39]  J. L. Quellec,et al.  DStretch® et l'amélioration des images numériques: applications à l'archéologie des images rupestres , 2013 .

[40]  Catherine Perlès.  Le Quellec J.-L., Fauvelle-Aymar F.-X., Bon F. (2009) – Vol de vaches à Christol cave. Histoire critique d’une image rupestre d’Afrique du Sud, publications de la Sorbonne, Paris , 2010 .

[41]  Frédérique Duquesnoy,et al.  "Premiers résultats du projet algéro-français de datation directe et indirecte des images rupestres dans la Tasili-n-Ajjer , 2010 .

[42]  L. Brady,et al.  Digital Enhancement of Deteriorated and Superimposed Pigment Art: Methods and Case Studies , 2012 .

[43]  Éric Robert.  Signes, parois, espaces. Modalités dexpression dans le Paléolithique supérieur ouest-européen , 2010 .

[44]  A. Gillespie.  Enhancement of multispectral thermal infrared images: Decorrelation contrast stretching☆ , 1992 .

[45]  David A. Rothery,et al.  Cover Decorrelation stretching as an aid to image interpretation , 1987 .

[46]  Robert Mark,et al.  Using super-high resolution panoramas (Gigapans) to document and study rock art panels , 2010 .

[47]  R. W. Christiansen,et al.  Multispectral Image Processing For Detail Reconstruction and Enhancement of Maya Murals from La Pasadita, Guatemala , 1999 .

[48]  Khieu Chan,et al.  The hidden paintings of Angkor Wat , 2014, Antiquity.

[49]  Norbert Mercier,et al.  OSL dating of quaternary deposits associated with the parietal art of the Tassili-n-Ajjer plateau (Central Sahara) , 2012 .

[50]  Valme Jurado,et al.  Laboratory and in situ assays of digital image analysis based protocols for biodeteriorated rock and mural paintings recording , 2011 .

[51]  Dave Cowley,et al.  The data explosion: tackling the taboo of automatic feature recognition in airborne survey data , 2014, Antiquity.

[52]  Inés Domingo Sanz,et al.  Nuevas tecnologías y restitución bidimensional de los paneles levantinos: primeros resultados y valoración crítica del método , 2005 .

[53]  F. J. Collado,et al.  Aplicación del plugin DStretch para el programa ImageJ al estudio de las manifestaciones pictóricas del abrigo Riquelme (Murcia) , 2013 .

[54]  James W. Henderson,et al.  Digitizing the past: A new procedure for faded rock painting photography , 2002 .

[55]  Linea Sundstrom,et al.  Digital infra-red photography for recording painted rock art , 2007, Antiquity.

[56]  Ian J. McNiven,et al.  Why digital enhancement of rock paintings works: rescaling and saturating colours , 2001, Antiquity.

[57]  Jean-Pierre Changeux,et al.  Raison et plaisir , 1994 .

[58]  L. De Cola.  Sefar : un parziale inedito del periodo delle Teste rotonde rilevato per mezzo della pulizia elettronica (P.E.) , 1997 .

[59]  R. E. Walker,et al.  Color enhancement of highly correlated images. I - Decorrelation and HSI contrast stretches. [hue saturation intensity , 1986 .

[60]  Juan Ortiz Sanz,et al.  A simple methodology for recording petroglyphs using low-cost digital image correlation photogrammetry and consumer-grade digital cameras , 2010 .

[61]  Jorge Angás Pajas,et al.  Assessment, dissemination and standardization of geometric data recording of Archaeological Heritage obtained from 3D laser scanning , 2009 .

[62]  Daniele Murra,et al.  Pattern recognition after image processing of low-contrast images, the case of the Shroud of Turin , 2013, Pattern Recognit..

[63]  Claudia Defrasne,et al.  Digital image enhancement for recording rupestrian engravings: applications to an alpine rockshelter , 2014 .