Sunday 6 April 2014

Using filters for bee-colour simulation

So far, I have been showing “bee-colours” (more accurately “false colour representations of the spectrum visible to bees”) that were generated by combining the UV-image with the blue and green channel of a second image taken with a filtration that passes visible light (e.g. UG40 or the Baader UV/IR cut filter.

Lately, I’ve been experimenting with filter stacks that pass UV, blue and green. It is interesting that both methods can result in quite similar images. I just want to show an example today. Within the next several weeks I’m planning to elaborate more on the topic.
Ranunculus ficaria, Bensheim 9 March 2014.

Camera: Panasonic Lumix broadband modified, with the EL-Nikkor 80mm/f5.6.

Visible light image (Filter: Schott BG40, 2mm)

UV image (Filter: Baader-U)


Bee-colours (Filter: Schott UG-5 + S8612, both 2mm), UV-flash


Bee-colours with channel swapping (blue->green, green->red, red->blue):


Image without any filters:


That's it for today. I will be posting more images and documentation on the method within the next several weeks.

5 comments:

  1. Hallo!
    Vielen Dank für diesen tollen Blog - alle Ihre Aufnahmen begeistern mich! Was ich mich die ganze Zeit über frage: Wie stellen Sie den Weißabgleich für die UV-Fotos ein?
    Viele Grüße und eine schöne Woche!

    ReplyDelete
    Replies
    1. Hallo,
      für UV-Aufnahmen verwende ich weißes Teflon (PTFE) zur Einstellung des Weißabgleichs. Panasonic Lumix Kameras kommen damit gut klar. RAW-Konverter können das Ergebnis allerdings wieder zu Nichte machen. In Lightroom musste ich ein eignes Profil erstellen. Phase One oder UFRaw (GIMP) kommen aber damit klar:
      Siehe auch:
      http://www.ultravioletphotography.com/content/index.php?/topic/81-how-to-make-uv-colours-reproducible/

      http://www.ultravioletphotography.com/content/index.php?/topic/258-white-balancing-uv-photos-in-lightroom/page__hl__lightroom__fromsearch__1

      Für andere Filterkombinationen verwende ich meist eine normale Graukarte.

      Grüße und vielen Dank für die Blumen,
      Nico Chalwatzis

      Delete
    2. Super, vielen Dank für die schnelle und ausführliche Antwort!

      Delete
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