Early : Meet Balu, the cuddly cute but slightly dense angel of a feline that one of my friends is blessed with.

If you want to by Balu a treat, you can buy 4k wallpapers of some images on Ko-Fi: ko-fi.com/s/01b5cab43a
(I will give 100% to his human, who is a student and not making much money)

@eyeling Surreal, but beautiful.

May I ask an ignorant question? The cat is the biggest heat source in the photos, so why doesn't he or she glow red? If I were to take equivalent photos with my cheap thermal camera (which, I know, is a different technology), Balu would be by far the brightest object in the frame.

@markusl This kind of IR isn't thermal. Yes, I called it "IR", but "near infrared" would be more appropriate. It's a 550nm lowpass filter which lets parts of visible light through. Thermal radiation doesn't register in a relevant way. en.wikipedia.org/wiki/Infrared

@eyeling Ah, thanks. I hadn't realised that there was an order of magnitude between the wavelengths you're capturing and the wavelengths used in thermal imaging. Presumably, an object that was almost hot enough to glow red would shine brightly in a near-IR photo, but a healthy cat doesn't come close to that. 🙂

@markusl Yes, exactly! A friend (physicist) and I hat a lovely time shooting our electric stoves and seeing the heated coils showing up in IR earlier than they're visible to the human eye. It's also fun being able to see through the darkened ceramic glass.

@eyeling @markusl Hah, I guess it makes sense that they'd use a darkening agent that would let through as much IR as possible -- even right up to near IR.

@eyeling @markusl those are really fascinating and abstract. Really like them.

@markusl @eyeling And the particular set of wavelengths that IR photography is highlighting is something that vegetation reflects a ton of, while fur apparently, does not.

@edyother @markusl THIS. I expected cats' fur to reflect similar to human hair, but it doesn't seem to. At least lighter fur doesn't. Black fur seems to work like expected. Case in point:

@eyeling @edyother Thanks. I can't compete. 🙂

From this thermal-imaging photo of our kitchen, I can tell that the dishwasher was on, that we'd recently made some tea, that we were defrosting something on the cooker and that our window frames leak heat, but no one is going to call these garish smudges beautiful or artistic!

(The outlines come from the phone's built-in camera, which operates in visible light. The thermal image comes from an old Flir One, which plugs in via USB.)

@eyeling There are all so good. Absolutely stunning use of infrared photography! :D

The cats are the same in any wavelength. Only the world around them changes...

@skobkin I guess you're right. Cats are eternal, a universal constant.

@eyeling I love these pics so much! They are stunning and Balu is surprisingly expressive for a cat :ablobcatheart:

@aidamarna Yeah, he`s such a cutie. I'll be sure to tell his human about your praise.

@thebiologist1117 That depends on how experienced you are to editing RAW photographs. Having experience there is a definite plus. There are also costs of having a camera converted (though sometimes you can get a cheap one on ebay). You can shoot with just a filter, but colours don't look good in most cameras due to the inbuilt highpass filter.
This video explains it all in detail: youtu.be/i5jllj6A_3w

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