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UV/IR Thermal or Xray Photography Humans happen to use visible light naturally but now we can go beyond the usual wavelengths we appreciate, to find out more about our world and ourselves.

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Old May 10th, 2016, 09:17 AM
Dr Klaus Schmitt Dr Klaus Schmitt is offline
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Default Sanvitalia multispectral

Sanvitalia flower in human vision, reflected UV, simulated butterfly and bee vision (left to right, top to bottom) - click link to see all images

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Old May 10th, 2016, 09:25 PM
Asher Kelman Asher Kelman is offline
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Klaus,

What is the logic and what is just artistic choice in showing the simulated colors here?

Asher
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Old May 11th, 2016, 03:13 PM
Antonio Correia Antonio Correia is offline
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Klaus,

How do you know the butterfly and bee see this way ? Based on experiments I suppose...

And how you do it ?
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Old May 12th, 2016, 04:13 AM
Dr Klaus Schmitt Dr Klaus Schmitt is offline
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Quote:
Originally Posted by Asher Kelman View Post
Klaus,

What is the logic and what is just artistic choice in showing the simulated colors here?

Asher
See my following answer....

Quote:
Originally Posted by Antonio Correia View Post
Klaus,

How do you know the butterfly and bee see this way ? Based on experiments I suppose...

And how you do it ?
We don't "this way", but we do know which spectral range they can see (based on neuronal and behavioural experiments...).
Humans: https://en.wikipedia.org/wiki/Trichromacy
Bees are Trichromats too, but see UV, Blue, Green and hence no red
Butterflies, birds, fish,.. https://en.wikipedia.org/wiki/Tetrachromacy
so they can see UV, Blue, Green, Red i.e. have a four dimensional color space.

Overall: https://en.wikipedia.org/wiki/Evolution_of_color_vision

What I have done is a well known method from aerial exploration, the mapping of invisual to us spectral ranges into our
color space - "color mapping" and of course some arbitrarily chosen colors for those invisible "colors", this is the "artsy part" of it.
But I have done it in a way which isn't contradictory (i.e. I don't use red for UV, as bees cannot see red, so that methods creates
at least subconciously a mess in viewers brains usually...)

Here about color mapping: http://www.mathworks.com/tagteam/811...rMap_57312.pdf
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Old May 12th, 2016, 04:16 AM
Antonio Correia Antonio Correia is offline
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I should have googled before asking !
Thank you Klaus
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Old May 12th, 2016, 04:26 AM
Dr Klaus Schmitt Dr Klaus Schmitt is offline
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Quote:
Originally Posted by Antonio Correia View Post
I should have googled before asking !
Thank you Klaus
That's my preferred method usually
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