“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!"
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.
"In this paper, we review the theory behind decorrelation stretch and propose some alternative algorithms that resolve the issues of the standard approach."
"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."
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...
Way better, thank you
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
Is there an imagemagick implementation that I can just throw into the pipeline?
“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!"
See also: Eulerian Video Magnification (EVM) to amplify subtle motions and colour changes:
https://youtu.be/ONZcjs1Pjmk https://youtu.be/_qtzWNZApsw
Amazing. This will change how I take photos
Going to be taking a lot more pictures of rock faces!
I want to try this on faded graffiti. I have a few spots in mind already.
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.
any repo or link where other people can try?
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."
The app is called DStretch, it's available for iOS and Android
https://dstretch.com/Apps/index.html
"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."
"Why do we need to spend resources trying to go to space, when there are problems right here on Earth that need solving?"
Weather satellites have done more to increase crop yield than anything since the invention of artificial fertilizer and save more lives.