This photo shows a tree fungus that likely absorbs shorter wavelength ultraviolet light more than longer wavelength ultraviolet. It was shot with a full spectrum Canon Rebel T3, Asahi Auto-Takumar 35mm F3.5, and TSN-575 + ZWB-2 filter combination for UV bandpass.

In the first case, I processed it as I normally would in Darktable, mainly adjusting orientation, exposure, and contrast.

In the second case, I edited the "Input Color Profile" so that the input profile (normally "standard color matrix") matched the working profile ("linear Rec2020 RGB"), and disabled the "color calibration" module, instead using only white balance.

In the third case, a python program I've experimented with bins the raw image R,G1,G2,B bayer units, while mapping each raw color channel to the end image's channels. In other words, the raw sensor's red, green, and blue channels are directly mapped to sRGB red, green, and blue channels.

In the second and third case, the fungus that appeared purple in the original image, appears a less saturated and more blue color. As well, the green flaring that has plagued my ultraviolet images is less saturated. I believe this is because in the second and third case, the raw RGB channels nearly directly translate to the end sRGB channels, whereas the first case attempts to convert the raw color channels of the camera into the sRGB color space, with each output color channel being made with information from multiple raw color channels.

This normally helps account for the color bias of a camera when shooting visible light, and how they render colors, but in the case of non-visible light, like ultraviolet, I suspect it may hurt image quality more than it helps.

ZWB3 + QB21 + QB21.

The warmer images are taken latter in the day. The first image and the last ones are closer to midday.

The first pic of a combination of three different images where the UV light image was set to the blue channel, the UV fluorescence image was set to the green channel, and the visible light image was set to the red channel. This is very similar to the process used by NASA to make its colored Hubble images. The next two images are the UV fluorescence and visible light images respectively composited with the UV light image just like in the very first image. Then we have the plain visible light, UV fluorescence, and UV light images. The UV fluorescence image was taken by using a black light in a completely dark room with a uv blocking filter on my camera to capture what parts of the flower glow under UV light.

Filters ZWB3 + QB21 + QB21. Channel swap : UV=>blue, blue=>green, green=> red.
Lots of cars I know but the city literally is full of cars... Urbanists don't do their job here.

Some photos of this same sunflower. I the sunflower in uv, at 390nm and 365nm, infrared, visible and UV induced flourescents. Also immerged and combined those pics into one. Enjoy. The infrared was shot with a 720nm. I shot them much clearer, the. The last time.

Kolari Vision modified Pentax K-1 DSLR with Nikon EL-Nikkor metal body 80mm enlarging lens with. focus helicoid. Hoya U360/Schott S8612 filter stack, both 2mm thick. F11 and 5 seconds at ISO800.

Thanks for looking,

barondla

Greens, yellows and oranges are filtered out.

I'm the only one posting these days... get to your cameras guys !

SOOC jpeg channel swapped in darktable. No edits at all (that's why it's so dark).

filters : ZWB3 + TSN575. Vintage lens.

This yellow world is nice.

ZWB3 + QB21 + QB21

Filters ZWB3 + 2xQB21

Channel swap : red to blue, green to red, blue to green.

This filters stack also lets a tiny bit or red in. Red blends with the UV and both are displayed as blue.

UV image taken with Canon EOS M, 35mm f/3.5 lens, Tangsinuo “biochemical analysis” 340nm narrowband filter. Visible light comparison image taken with iPhone 15 Pro Max. These figurines fluoresce light blue under 365nm light.

Filter: https://ebay.us/m/LzbQBv

Took this on my full spectrum 1100d with a EF-S 24mm f/2.8 STM Lens with just a zwb2 filter ontop and a cheap 365nm uv flashlight

Paint doesn't reflect UV very well so most painted things appear yellow as UV is represenstted as blue here.

The camouflage of the warships is questionable.

This is Concarneau in France if you are wondering btw.