Reveal petroglyphs with digital magic: LAPC

Did you know you can reveal petroglyphs with a little digital magic? Yep, there’s an app for that. In this post, I’ll show you how I revealed several petroglyphs with the app, Rock Art Enhancer. Click through the slideshow of each image below.

In each of the first pictures, I show the original image. In the second, I used the Auto level and increase saturation tool. The third pictures show a variety of effects. All of these petroglyphs are located in southeast Oregon.

These petroglyphs were carved into rock thousands of years ago and over time they have become less clear. Unfortunately, the messages conveyed by many of these carvings are unknown. While some show obvious elements of wildlife, humans, and the sun, others are open to interpretation.

Revealing petroglyphs with an app

The first series shows petroglyphs on a rimrock cliff located in Harney County. The second effect brings out the details, but I prefer the almost psychedelic colors in the third image. The third effect used the Decorrelation Stretching (abbreviated as D. Stretch) YUV Custom tool.

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Petroglyphs & pictographs in Harney County, Oregon

In April 2019, I went on a field trip to see petroglyphs & pictographs in Harney County, in eastern Oregon. This is one of the many trips offered as a part of the Harney County Migratory Bird Festival. Our guides that day were Bureau of Land Management archaeologists, Scott Thomas and Carolyn Temple.

One of the first things we learned was the difference between petroglyphs and pictographs.

Pictographs

Pictographs, like the images shown below, are painted onto rocks. These works are generally drawn with red, black, white, or yellow paint.

Pictographs frequently include depictions of animals. For example, the drawing at the top of the picture below appears to be a lizard.

petroglyphs & pictographs, Harney county, OR
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