rvalue, 8 months ago

@bcrypt something-something rolling shutter plus a large hot thing in the foreground to mess with the sensitivity response curve of the CCD…?

indrora, 8 months ago

@bcrypt Super bright sodium vapor tubes can produce enough UV to take out columns/rows of a CCD, so that might have something to do with it.

obtusatum, 8 months ago

@bcrypt What camera? Spent some time at Apple working on rolling shutter detection but it can be tricky. Easiest way to avoid it is to switch to a manual shutter speed that isn't a multiple of the lighting flicker.

bcrypt, 8 months ago

@obtusatum IIRC this was the iPhone XR

bcrypt, 8 months ago

@obtusatum i should mention though my goal is to deliberately induce this effect, not avoid it :)

obtusatum, 8 months ago

@bcrypt oh! Then just use a manual exposure app (I like Manual) and mess with the shutter speed.

redteamwrangler, 8 months ago

@bcrypt perhaps flicker in the lighting interacting with the rolling shutter. it's along the correct axis for that.

poswald, 8 months ago

@bcrypt It almost looks like rolling shutter in sync with florescent light strobing or something, but I wouldn't expect it to be blurry... maybe the phone's post-processing pipeline then partially wiped it out? Was it an Android phone? Very strange.

bcrypt, 8 months ago

@poswald it was an iPhone XR. i think rolling shutter makes sense from the lights!

gsuberland, 8 months ago

@bcrypt weird PWM thing with the lighting, probably.

tbr, 8 months ago

@bcrypt It feels like interaction of rolling shutter with light frequency. Probably a visual beat 'tone' due to close frequencies.