DStretch

Web Site for the DStretch plugin to ImageJ. DStretch is written by Jon Harman.

A tool for the digital enhancement of pictographs


DStretch Tutorials

DStretch Applet
DStretch from the web!
DStretch animated image

DStretch Rock Art Slideshows

DStretch Conference Presentations

DStretch Help
Mode d'emploi de DStretch

DStretch News: Click to view the latest DStretch events and additions to the web site.


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.  I have done much work on the very important Great Mural site 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.


Current version is 7.8.  Its free for amature users. For professionals and those who appreciate this unique software the suggested donation is $50.00.

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.

Jon Harman

Remembering Alvin R McLane

Alvin McLane and Petroglyph

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 the 2007 ARARA meeting 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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