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+--- Thread: Sudden White Balance Shifts and Flicker (/Thread-sudden-white-balance-shifts-and-flicker)
Sudden White Balance Shifts and Flicker - ogarrah - 2024-08-09
Hello all,
In one of my recent sequences, I noticed instances of abrupt white balance shifts and flicker that seemed to be contained only to certain light values. The sequence is linked below, the WB shift is most apparent at :07, :15, :22, :25 and :32. The flicker is visible at :11, :27 and :29.
https://youtu.be/K3o-_cfsRUM
For some context around camera and editing settings, this was shot with my lens' smallest aperture (f/22) and I have attached screenshots in LRC of the tone control settings for the whole image and a mask for the sky (which shows most of the flickering). In addition to the settings shown, I also lightly adjusted the parametric tone curve (very subtly however). In LRTimelapse, I applied multiple runs of deflicker on first the whole image, then a few smaller reference areas, there was quite a lot of flicker and that was as good as I could get it. The white balance in LRC was also kept constant for the entire images duration.
I have some theories about what is causing this, perhaps it is a function of me shooting at my camera's smallest aperture (the RAW sequence has a TON of flicker) and then overdoing the flicker removal in LRT? Or is it my use of clarity and dehaze and/or overdoing it on contrast and white/black? Some combination of all the above or something else I've missed?Please let me know what you think! It's a very cool shot and I desperately want to save it (also please ignore the obscene amounts of dust spots I'll worry about them later :p). Thanks in advance for your help!
RE: Sudden White Balance Shifts and Flicker - Gunther - 2024-08-09
I'd recommend watching Expert Tips tutorial #5 which will shed a lot of light on your issues: https://lrtimelapse.com/tutorial/expert/
generally, if LRTimelapses Multipass Delicker don't remove "flicker" after some passes, it's not luminance but contrast flicker mostly introduced by Lightroom.
Apart from that shooting with f/22 is very bad practice, not only because of flickering but also because the results won't be really sharp because of optical diffraction happening. Google for that to understand it. Generally I wouldn't should with smaller aperture than f/8 max f/11.