IR
Feb 20, 2023 16:24:24 #
Feb 21, 2023 08:36:23 #
Photo 2 appears to be a simple R/B swap with attractive results distinctly different than the same if taken with an unmodified color camera. People unfamiliar with IR-shifted** photos would do a double take.
[**The use of a 590 nm filter of course is not full nIR.]
Photo 1, with a 720 nm filter, one would expect to be a B&W... you added color to the B&W?
[**The use of a 590 nm filter of course is not full nIR.]
Photo 1, with a 720 nm filter, one would expect to be a B&W... you added color to the B&W?
Feb 21, 2023 09:37:39 #
wingclui44
Loc: CT USA
dpullum wrote:
Photo 2 appears to be a simple R/B swap with attractive results distinctly different than the same if taken with an unmodified color camera. People unfamiliar with IR-shifted** photos would do a double take.
[**The use of a 590 nm filter of course is not full nIR.]
Photo 1, with a 720 nm filter, one would expect to be a B&W... you added color to the B&W?
[**The use of a 590 nm filter of course is not full nIR.]
Photo 1, with a 720 nm filter, one would expect to be a B&W... you added color to the B&W?
Yes, 590nm will make the color much closer to the visible light spectrum. The second one was from a 680nm filter not 720nm, sorry I made a mistake, but the are very close. It came out with light yellowish grey, I did the R/B swap and further enhanced the color, plus darken the sky more.
here's the original of #2:
Feb 21, 2023 09:38:26 #
Feb 21, 2023 10:05:29 #
Feb 21, 2023 10:21:20 #
wingclui44
Loc: CT USA
sueyeisert wrote:
Photo #1 with 720 filter would not have color.
Sorry, #1 was taken with 680nm, I already mentioned I made a statement mistake.
720nm dose have some color.
720nm out from the camera
after PP
Apr 5, 2023 14:16:23 #
petrochemist
Loc: UK
sueyeisert wrote:
Photo #1 with 720 filter would not have color.
Not true.
Depending on the white balance used and the actual wavelengths of IR present when the shot is taken it can have subtle colours that can then be boosted on processing with the saturation controls.
I've found that dyed hair can often get a blue tinge when shot with a 720nm filter, particularly on my stock (unconverted) K100d which is moderately sensitive to wavelengths up to about 800nm. My wife doesn't like me sharing the evidence.
Bayer filters generally show transmission variations between the channels between 700nm & 800nm but then tend to look quite similar above ~850nm
Apr 5, 2023 14:17:20 #
Jan 12, 2024 09:31:23 #
wingclui44 wrote:
R720 and R590
Wow
I bet you had to do a lot of fiddling! I have never gotten such good color from my 620nm Nex C3!
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