On March 3, 2018 at 17:43, Fins said...
Edit: also, what you may really need is a polarized filter. This is a common one in photography to reduce or prevent glares.
From
[Link: digital-photo-secrets.com]:
When the sun strikes a reflective object at angle, it can sometimes cause the light to reflect into your camera. If you break this down, it means there are two causes of glare. The angle of the sun causes it and so does the presence of reflective objects.
What they don't mention is that reflections do not include all angles of polarization of light. A polarizing filter can attenuate the polarized light that is glare.
But I'm not talking about correcting for glare. I'm talking about a portion of the spectrum being presented as a different portion of the spectrum: IR appears as white, blowing out subtle sunset colors.
I can't think of a good sonic analogy, so here's a bad one: You've got a hifi system and it performs really well. That's the camera not allowing IR to influence the image.
But an audio system that would take, say, all frequencies below 100 Hz, convert them to some scale that's non-harmonically related to the original frequencies, and mix them in... that's the cell phone camera showing IR as white or purplish. That is, all of the original image is there (as was all of the music) but there's ALSO some stuff in the original frequency spectrum that wasn't there before it went through the system.
What I'm saying is that high levels of IR exist in sunset lighting and in lighting where a lot of heat is generated, and I want to keep that IR from affecting the photograph. I don't see that IR at all, and if my camera sees it as white, I won't be able to get a photograph of what I see.
