Camera Flashes – Red Camera Rolling Shutter Issues

[rob fisher]

Hi,

Soon I will be working on a video that will have in camera camera flashes. The issue is half exposed frames caused by the rolling shutter (half flash, half normal exposure).

Three part query:

1. Does anyone know of a way to avoid this when shooting red – tips I can pass on to the prod folks.

2. Is there a way to fix these half frames with flame, or a third party spark, or a pc/mac software solution outside of the flame that anyone knows of?

3. If they don’t shoot the flashes in camera and we add them in later, does anyone have any cool tricks they want to show off to create a realistic camera flash that exposes nicely across all objects in the frame? I’d done something last year where we just blew out the ‘half frames’ but I’d prefer to do something a little more fancy this time around.

any help/tips/suggestions are much appreciated. really I’d love to hear about the third way regardless of if we can come up with an in camera solution or not.

(don’t worry I won’t be making any money for this – your tips are purely to further my education on the box)
🙂

-rand.

[Saran Sirikasamsap]

to avoid it while shooting i think they have to avoid panning too fast;

u could export to nuke and try the rolling shutter plugin.. in flame i usually warp and paint those frames to minimize it..

u could try using optics with a custom matte wipe with a hard light + overlay + blend logic ops to belnd in a custom flash over the shot.. i genarts plugs also have a nice one in the lens flare options, i think its called Dv or something, make it flash in and out on black using a tiny circular matte, i usually process that at 2k or 4k so it can cover a whole 1080/576/486 frame, with a little scaling and blur..use 2 layers one blurred and one sharp, use the sharp one with a bad / jagged luma key so that a few random areas are sharp, so it looks more organic.. good luck. FILM ROCKS 🙂

[new way]

thanks rohit, I’ll give that a go and see how it turns out.

[Anonymous]

there is no way to avoid camera flashes only exposing part of the shutter. it’s a rolling shutter on the RED camera. It’s NOT a mechanical shutter like we’d prefer.

basically, the top and bottom parts of the sensor are actually exposed to light at slightly different real world times, so, fast things (muzzle flashes, camera flashes) are not guaranteed to show up on all of your frame.

its a royal pain in the ass and there’s no real fix that i know of. it;s gonna be a by-hand kinda thing.

there are rolling shutter reducers out there, as in Sparks, but, those are mostly for the vertical line’s skewing during heavy camera motion.

[Author]

Posts