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UltravioletPhotography

Tricolour IR Fluorescence (now completed)


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I took advantage of the long winter nights to do some fluorescence photography. Here are some results of UV- and Visible-Induced IR fluorescence, done in tri-colour.

 

I’ve also included standard visible and a few UVIVF images for comparison.

 

(There are some more tri-colour IR Fluorescence images, using rock samples at https://www.ultravio...__fromsearch__1 )

 

 

The Tricolour channel assignments are:

 

Red Channel: 1000nm

Green Channel: 850nm

 

Blue Channel: 750nm

 

Light Sources:

UV: Nemo Torch

 

Visible: Lumitact LED torch.

 

Narrower-band Excitation

 

My available UV light sources and filters did not allow for excitation using a narrower band of the UV spectrum, but this was possible using visible light. This set of images includes Visible-Induced IR Fluorescence excited by white, blue (470nm), green (520nm), and red (635nm). Apart from colour cast, there is not a lot of difference, and so all later Visible-induced IR Flourescence images use just white excitation.

 

The blue and red colour casts on the blue- and red-excited images cannot be due to any form of blue or red visible light leak: blue and red in the image is caused by transmission through 750nm and 1000nm bandpass filters and there is no reason why blue light would leak only through the 750nm filter and red light would leak only through the 1000nm filter.

 

Orchid:

 

Visible..........................................................................UV-Induced Visible Fluorescence

post-245-0-36409100-1618065394.jpg post-245-0-01846900-1618065414.jpg

 

UV-Induced IR Fluorescence

post-245-0-66478000-1618065811.jpg

 

Visible (White)-induced IR Fluorecence......................Visible (Blue)-induced IR Fluorescence

post-245-0-30494500-1618065855.jpg post-245-0-77170500-1618065880.jpg

 

Visible (Green)-induced IR Fluorecence.....................Visible (Red)-induced IR Fluorescence

post-245-0-16100700-1618065916.jpg post-245-0-77986100-1618065926.jpg

 

 

White Balancing

 

How do you white balance images like this? I started off with using WB based on a white section of a rock, but this often just gave visually uninteresting so I started WBing against elements of the image. This example shows the differences this can produce.

 

Lily

 

Visible....................................................................................................................UV-Induced Visible Fluorescence

post-245-0-81671800-1618066018.jpg post-245-0-61903600-1618066037.jpg

 

Visible-Induced IR Fluorescence:

 

Rock WB method:..................................................................................................WB against dark area at top-left:

post-245-0-76095200-1618066082.jpg post-245-0-46660900-1618066100.jpg

 

WB against leaf:

post-245-0-41190800-1618066160.jpg

 

UV-Induced IR Fluorescence:

 

WB against leaf:

post-245-0-29900000-1618066195.jpg

 

Forsythia:

 

Visible:

post-245-0-47028000-1618066254.jpg

 

UV-Induced IR Fluorescence:................................................................................Visible-Induced IR Fluorescence:

post-245-0-50223600-1618066264.jpg post-245-0-20872000-1618066273.jpg

 

Flaming Katy:

 

Visible:..................................................................................................................UV-Induced Visible Fluorescence:

post-245-0-06178100-1618066384.jpg post-245-0-82432500-1618066395.jpg

 

UV-Induced IR Fluorescence:...............................................................................Visible-Induced IR Fluorescence:

post-245-0-73443100-1618066411.jpg post-245-0-14053700-1618066420.jpg

 

For both of these images, saturation has been increased and WB was against the leaf.

 

Winter Aconite:

 

Visible:

post-245-0-09742700-1618066543.jpg

 

UV-Induced IR Fluorescence:...............................................................................Visible-Induced IR Fluorescence:

post-245-0-81277600-1618066529.jpg post-245-0-25185100-1618066555.jpg

 

Chrysanthemum:

 

Visible:

post-245-0-38390800-1618066612.jpg

 

UV-Induced IR Fluorescence:.................................................................................Visible-Induced IR Fluorescence:

post-245-0-95809400-1618066623.jpg post-245-0-74311800-1618066640.jpg

 

Visible:...................................................................................................................UV-Induced IR Fluorescence:

post-245-0-38190100-1618066740.jpg post-245-0-28441900-1618066754.jpg

 

Jasmine:

 

Visible:

post-245-0-20554300-1618066816.jpg

 

UV-Induced IR Fluorescence:................................................................................Visible-Induced IR Fluorescence:

post-245-0-65151600-1618066839.jpg post-245-0-37081200-1618066851.jpg

 

WB was against the stamen tip.

 

Snowdrop:

 

UV-induced Visual Fluorescence:.........................................................................Visible-Induced IR Fluorescence:

post-245-0-13080100-1618066929.jpg post-245-0-79294500-1618066940.jpg

 

These imges were WBed on the light part of the petals.

 

Daffodil:

 

Visible:..................................................................................................................UV-Induced Visible Fluorescence:

post-245-0-66072500-1618066996.jpg post-245-0-20746200-1618067010.jpg

 

UV-Induced IR Fluorescence:...............................................................................Visible-Induced IR Fluorescence:

post-245-0-06910000-1618067022.jpg post-245-0-20495600-1618067038.jpg

 

WB was against the stigma tip

 

Tulip:

 

Visible :...............................................................................................................UV-Induced Visible Fluorescence:

post-245-0-13588300-1618067155.jpg post-245-0-29499100-1618067168.jpg

 

UV-Induced IR Fluorescence:.............................................................................Visible-Induced IR Fluorescence:

post-245-0-78215000-1618067183.jpg post-245-0-55396600-1618067197.jpg

 

These last two images were WBed on the stigma.

 

And now something completely different – Sugar Cubes:

 

Visible:..............................................................................................................UV-Induced Visible Fluorescence:

post-245-0-67086200-1618067295.jpg post-245-0-55439900-1618067308.jpg

 

UV-Induced IR Fluorescence:...........................................................................Visible-Induced IR Fluorescence:

post-245-0-73502200-1618067317.jpg post-245-0-03315300-1618067330.jpg

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What is that second sugar cube? Is that brown sugar?

 

Yes. I was surprised at the difference between white and brown.Perhaps that's why the Rolling Stones thought so highly of it.

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These photos are excellent.

Oh and Bernard, Rolling stone's Brown sugar is not what you think.

Time for you to carefully read the lyrics.

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Fantastic results Bernard.

Fascinating are the different fluorescence in IR with each wave bans used.......seems it is never ending......

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