NASA Color Trick Was Meant for Mars. Now It's Unveiling Rock Art on Earth

pimlottc•about 1 hour ago

This is based off a NASA article, which has an expanded version with more details here:

https://spinoff.nasa.gov/Manipulating_Satellite_Photos_Now_R...

homeonthemtn•about 1 hour ago

Way better, thank you

matja•about 1 hour ago

You can do something similar in GIMP:

1) Colors > Components > Decompose > LAB

2) For the layers of the A/B (chroma) channels, Colors > Levels > "Auto Input Levels" (maximize the contrast), and move the mid point to the median.

3) Colors > Components > Compose > LAB

mlmonkey•44 minutes ago

Is there an imagemagick implementation that I can just throw into the pipeline?

dylan604•about 1 hour ago

“No one really knows why people made the rock art they made, at least in many cases,” Harman said

Well, it's obvious they really wanted to though. This isn't like marking on a wall with a Sharpie. They had to work at it to make it happen. The commitment alone is impressive even if it was just a "Grogg was here!"

HPsquared•about 1 hour ago

See also: Eulerian Video Magnification (EVM) to amplify subtle motions and colour changes:

https://youtu.be/ONZcjs1Pjmk https://youtu.be/_qtzWNZApsw

NDlurker•about 2 hours ago

Amazing. This will change how I take photos

Aboutplants•about 1 hour ago

Going to be taking a lot more pictures of rock faces!

NDlurker•7 minutes ago

I want to try this on faded graffiti. I have a few spots in mind already.

cwmoore•about 1 hour ago

No tricycle-riding penguins yet.

In reality very interesting work and results, but a little disturbing that it took three or four decades and a self-funded citizen scientist to transfer the knowledge to the application.

tedecristal•about 2 hours ago

any repo or link where other people can try?

ortusdux•about 2 hours ago

Matlab - https://www.mathworks.com/help/images/enhance-color-separati...

This paper might also be of interest - https://www.mdpi.com/2227-7390/13/20/3297

"In this paper, we review the theory behind decorrelation stretch and propose some alternative algorithms that resolve the issues of the standard approach."

pimlottc•about 2 hours ago

The app is called DStretch, it's available for iOS and Android

https://dstretch.com/Apps/index.html

ButlerianJihad•22 minutes ago

"A contribution is mandatory before I will send the plugin. It may take me a few days to respond, have patience. Please note that the plugin is not an app. It has much more functionality than is possible in an app on a smartphone."

"The DStretch [mobile] app is a lightweight version of DStretch intended to give users the ability to enhance rock art in the field. It is not a substitute for the DStretch plugin which has much more functionality."

NASA Color Trick Was Meant for Mars. Now It's Unveiling Rock Art on Earth

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