• Ultraviolet Photography
  •  

Dog in UV and IR

Processing Multispectral
18 replies to this topic

#1 Stefano

    Member

  • Members(+)
  • 1,813 posts
  • Location: Italy

Posted 23 April 2021 - 22:53

Camera: Full-spectrum Canon EOS M
Lens: Soligor 35 mm f/3.5
Filters:
UV: ZWB2 (2 mm) + Chinese BG39 (2 mm)
IR: Hoya R72

The first images are UV:

f/4(?), ISO 6400, 1/30 s exposure (repost from here):
Attached Image: IMG_2173.JPG

f/4(?), ISO 6400, 1/30 s exposure
Attached Image: IMG_2158.JPG

f/(?), ISO 25600, 1/15 s exposure
Attached Image: IMG_2159.JPG

f/(?), ISO 3200, 1/30 s exposure. A bit out of focus, but I like it:
Attached Image: IMG_2154.JPG

These last two are IR:

f/(?), ISO 100, 1/60 s exposure
Attached Image: IMG_1826.JPG

f/(?), ISO 400, 1/500 s exposure. Starting with the raw image, I increased the saturation to the max in Photo Ninja. Then saved it as a .jpg, opened it in IrfanView, increased the saturation to the max again, and swapped the red and blue channels (BGR).
Attached Image: Sat PN IW.jpg

Edited by Stefano, 23 April 2021 - 23:06.


#2 Andy Perrin

    Member

  • Members+G
  • 4,098 posts
  • Location: United States

Posted 23 April 2021 - 22:58

Cute in all wavelengths.

#3 Stefano

    Member

  • Members(+)
  • 1,813 posts
  • Location: Italy

Posted 23 April 2021 - 23:04

Red parts of animal bodies (his eyes, which are reddish, his tongue, as well as my lips) are UV-yellow. Maybe blood, in a thin layer, is UV-yellow.

#4 colinbm

    Member

  • Members+G
  • 2,423 posts
  • Location: Australia

Posted 24 April 2021 - 00:39

Nice dog & well behaved model.

#5 Stefano

    Member

  • Members(+)
  • 1,813 posts
  • Location: Italy

Posted 24 April 2021 - 02:01

View Postcolinbm, on 24 April 2021 - 00:39, said:

Nice dog & well behaved model.
When he doesn't try to bite the lens... but he's a nice dog.

#6 Stefano

    Member

  • Members(+)
  • 1,813 posts
  • Location: Italy

Posted 24 April 2021 - 02:06

View PostStefano, on 23 April 2021 - 23:04, said:

Red parts of animal bodies (his eyes, which are reddish, his tongue, as well as my lips) are UV-yellow. Maybe blood, in a thin layer, is UV-yellow.
And sure enough... according to this source, the absorption of oxygenated hemoglobin in water has a low at 368 nm. We can argue about the precise hue 368 nm has in UV (and still, it is a broad peak), but often if not always it is a shade of yellow. Our blood is dark yellow in UV, or so it seems.

#7 Andrea B.

    Desert Dancer

  • Owner-Administrator
  • 8,787 posts
  • Location: UVP Western Division, Santa Fe, New Mexico

Posted 24 April 2021 - 02:27

Very nice to see these dog images. I love how his nose looks in IR.

And what is Dog's name??
Andrea G. Blum
Often found hanging out with flowers & bees.

#8 Stefano

    Member

  • Members(+)
  • 1,813 posts
  • Location: Italy

Posted 24 April 2021 - 02:55

View PostAndrea B., on 24 April 2021 - 02:27, said:

And what is Dog's name??
Sugar.

#9 Andrea B.

    Desert Dancer

  • Owner-Administrator
  • 8,787 posts
  • Location: UVP Western Division, Santa Fe, New Mexico

Posted 24 April 2021 - 03:00

:smile:
English Sugar or Zucchero?
Andrea G. Blum
Often found hanging out with flowers & bees.

#10 UlfW

    Ulf W

  • Members+G
  • 1,614 posts
  • Location: Sweden, Malmö

Posted 24 April 2021 - 05:12

Love the paw image!
Ulf Wilhelmson
Curious and trying to see the invisible.

#11 Stefano

    Member

  • Members(+)
  • 1,813 posts
  • Location: Italy

Posted 24 April 2021 - 11:04

View PostAndrea B., on 24 April 2021 - 03:00, said:

:smile:
English Sugar or Zucchero?
English Sugar. We actually gave him an English name.

#12 dabateman

    Da Bateman

  • Members+G
  • 2,779 posts
  • Location: Maryland

Posted 24 April 2021 - 12:37

So he is white in UV, visible and IR?
Thats interesting.

#13 Stefano

    Member

  • Members(+)
  • 1,813 posts
  • Location: Italy

Posted 24 April 2021 - 20:28

View Postdabateman, on 24 April 2021 - 12:37, said:

So he is white in UV, visible and IR?
Thats interesting.
Yes. In UV he is just slightly lavender, so in UVB he is probably a bit darker, but he is reflective in all wavelengths.

#14 OlDoinyo

    Member

  • Members(+)
  • 865 posts
  • Location: North Carolina

Posted 24 April 2021 - 20:34

View PostStefano, on 24 April 2021 - 20:28, said:

Yes. In UV he is just slightly lavender, so in UVB he is probably a bit darker, but he is reflective in all wavelengths.

So not like a polar bear or juvenile harp seal. Not all white fur is really white, evidently.

#15 Stefano

    Member

  • Members(+)
  • 1,813 posts
  • Location: Italy

Posted 25 April 2021 - 16:44

Another image, here the lavender color can be seen better:

f/4(?), ISO 1600, 1/30 s exposure
Attached Image: IMG_2231.JPG

BGR version:
Attached Image: IMG_2231 BGR.JPG

#16 Andrea B.

    Desert Dancer

  • Owner-Administrator
  • 8,787 posts
  • Location: UVP Western Division, Santa Fe, New Mexico

Posted 25 April 2021 - 17:32

He is lavender! Interesting. The ears are a big darker which is cute.

Does Sugar have dark skin under his white coat?
What kind of dog is this?
Andrea G. Blum
Often found hanging out with flowers & bees.

#17 Stefano

    Member

  • Members(+)
  • 1,813 posts
  • Location: Italy

Posted 25 April 2021 - 18:06

He has brownish spots that look darker in UV. His skin is both pink and black, when his nose is wet you can see the black/pink spots underneath.

He is similar to a Sicilian shepard, translating from Italian, but he is not from a pure breed.

#18 Andy Perrin

    Member

  • Members+G
  • 4,098 posts
  • Location: United States

Posted 25 April 2021 - 20:21

I honestly love the lavender one.

#19 Stefano

    Member

  • Members(+)
  • 1,813 posts
  • Location: Italy

Posted 25 April 2021 - 21:05

View PostAndy Perrin, on 25 April 2021 - 20:21, said:

I honestly love the lavender one.
Thanks!