DStretch

Web Site for the DStretch plugin to ImageJ

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


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.

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.

I will be away from August 25 to September 7.  I will respond to requests when I get back.

Current version is 7.0.  Its free, but contributions are welcome.

I have started a list of those who wish to get new versions as they come out.  Email me to get on the list.

Suggested contribution is $50. You can make a contribution via PayPal. My account is DStretch@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

DStretch News

 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.



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




Rocks of Ages Exhibit Announcement
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 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 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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