DStretch

DStretch can bring out faint pictographs that are invisible to the naked eye.  It works on digital camera images.  No special filters or lighting are needed.  To see what it can do check out the slide shows, especially Rocky Hill and Tulare.  More Rocky Hill images are in the RA 2006 presentation on Rocky Hill.  The ARARA 2007 presentation has some beautiful images from Kachina Rockshelter in Nevada.     My wife Sheila and I visited Tanzania in 2009.  DStretch worked very well as can be seen in the Masange slideshow.  My latest work has been on Cueva San Borjitas.  I gave presentations about this incredible site at SAA 2011 in Sacramento and ARARA 2011 in Idaho falls and Rock Art 2010 in San Diego and Balances 2010 in Ensenada and have a slideshow about it here.

DStretch uses decorrelation stretch.  This is an image enhancement technique first used on aerial photos.  For an explanation of how it works see the algorithm description.

DStretch is a tool for rock art researchers who wish to enhance images of pictographs.  It is a plugin to ImageJ.
ImageJ is an image processing and analysis program written in Java.  It needs to be installed first before you can use DStretch.

Email DStretch@prodigy.net to get DStretch.

Alternatively send me your email address using the form below. If you use the form double check your spelling.

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Current version is 7.1.  Its free, but contributions are welcome. Allow a couple days for me to reply with the plugin.

Contributors will receive new versions as they come out.

Suggested contribution is $50. You can make a contribution via PayPal. My account is JonHarman "at" prodigy.net.  If you want to send a check you will find my address on the email I send with the plugin.

DStretch plugin written by Jon Harman.

DStretch News

Canadian Geographic article on historic graffiti revealed by DStretch Historic graffiti.  New technology reveals details of rock inscription left by Simon Fraser. By Brad Himour April 2011 issue

DStretch Workshop at the ARARA 2011 Conference in Idaho Falls 7 pm Thursday, May 26, 2011 Shilo Inn Conference Center in Idaho Falls From the ARARA web site: For the 2011 ARARA Conference, Jon Harman will conduct a 2-hour workshop on DStretch — the ImageJ plug-in he developed for image enhancement which is now being used worldwide. This hands-on workshop will be held on Thursday evening at 7 p.m. at the Shilo Inn in Idaho Falls. Using images from around the world, Dr. Harman will discuss the basics of DStretch enhancement and more advanced topics. Bring your computers! Dr. Harman will install DStretch for those who don't have it and will help you to get the best enhancements from your own images. The workshop fee is $20 and can be paid along with your Conference registration.

Talk at SNRAA October 25 2010 in Las Vegas I will give a talk about rock art in the Kondoa region of Tanzania.  There will be lots of pictures of rock art and DStretch enhancements.

Rock Art 2010 Conference in San Diego Nov 6 I will give a paper about San Borjitas at the conference.  I will give the same paper Nov 7 in Ensenada at the Balances 2010 conference. Here is the abstract: Cueva San Borjitas: Birthplace of the Great Mural Tradition. Cueva San Borjitas is located in the Sierra de Guadalupe near Mulege, BCS.  It has over 80 anthropomorphs on its ceiling painted in the Great Mural Tradition.  The styles found in San Borjitas are quite varied compared to the Great Mural sites of the Sierra de San Francisco.  There are anthropomorphs in Cueva San Borjitas that are similar in style to the Sierra de San Francisco sites, but these are superimposed over other styles unlike anything in that sierra.  This provides strong evidence that the Great Mural Tradition started in the Sierra de Guadalupe before moving to the north.  This talk will examine the different styles and figure superpositions at San Borjitas. The work presented in this talk is part of a project by INAH archaeologist María de la Luz Gutiérrez in the Sierra de San Francisco and Guadalupe.

 DStretch Workshop March 25, 2010 at the ARARA Del Rio Meeting

Here is the ARARA announcement:

DStretch Workshop - Jon Harman will conduct a 2-hour workshop on DStretch  (see dstretch.com) - the ImageJ plug-in he developed for image enhancement and which is now being used worldwide. This hands-on workshop will be held on Thursday evening at 7 pm at the Ramada Inn, Del Rio. Using images from around the world Dr Harman will discuss the basics of DStretch enhancement and more advanced topics. Bring your computers! Dr Harman will install DStretch for those who don't have it and will help you to get the best enhancements from your own images. For more information or to sign up, please send an e-mail to Donna Gillette (rockart@ix.netcom.com). The workshop fee is $20 and can be paid at registration.

Primera aplicación de DStretch-ImajeJ. Mejora automatizada de imagen digital en el arte rupestre cubano.

This exhibit has moved to:
Maidu Interpretive Center 1960 Johnson Ranch Drive
Roseville, California 95661 (916) 774-5934
Exhibit continues through December 2009

Remembering Alvin R McLane

Alvin McLane died October, 2006 in Reno Nevada.  An obituary is here.  Without doubt Alvin was the premier rock art researcher in Nevada.  I went on many rock art trips with Alvin and will miss him greatly.  I have put together a slideshow of my pictures of Alvin.   At NAA in Ely, Nevada I gave a presentation on Alvin's last road trip.  At ARARA in Billings, Montana I gave a presentation on Kachina Rockshelter, a place I visited with Alvin on the trip.  Alvin and I intended to write a paper on the sites we visited.

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