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Inspiring
December 24, 2016
Answered

Help! Phone Green screen with tracking points!

  • December 24, 2016
  • 1 reply
  • 10808 views

What would be the best way to key and remove the screen fixtures to replace the screen with something else?

Thanks in advance m8's!

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Correct answer Roei Tzoref

I agree with Roei 100% on not adding tracking marks to this kind of shot. There's plenty to track with the edges of the phone. I also would not ever shoot a shot like this with a green screen on the phone. You'd be better off with the phone off. The black screen would act like a mirror and give you reflections you could use and natural highlights that would sell the shot. All you would be left with would be a little procedural matting on a copy of the phone screen and some blend mode to pull in the reflections and to do the final color grading.

I probably would have used a similar procedure to stabilize the shot because roto is almost always easier if you stabilize first. I might even have tried some a procedural matte to remove the tracking markers. It's a good thing this is free footage. If you paid somebody to shoot the footage you should probably ask for a reshoot. This is why you want a visual effect supervisor on the set.


I also would not ever shoot a shot like this with a green screen on the phone. You'd be better off with the phone off. The black screen would act like a mirror and give you reflections you could use and natural highlights that would sell the shot. All you would be left with would be a little procedural matting on a copy of the phone screen and some blend mode to pull in the reflections and to do the final color grading.

last time we had this discussion we settled for a grey background with a little noise. this way you can have the reflection but also get the exact framing for the replacement and not a dark screen the will blend with the phones edges if the lighting is a bit dimmed. in this case for example, a grey background would probably emit some light on the hands (like the green screen did) and this could also help better sell the shot.

1 reply

Roei Tzoref
Legend
December 25, 2016

you need to Roto the hand and next time don't create these crosses or a green screen that eat's up the pixels with this intensive light spill you will have to cover over, and instead just load a gray a bit of noisy texture on your phone. if you can, I would re-shoot. if you want, upload the shot and we can try to guide you through the process.

Inspiring
December 25, 2016

Not my footage, just found it on the internet to match the scene i'm about to film. Thanks for your reply.

What do you mean by noisy texture and cover up? Maybe black screen is the way to go (I don't know) to get the reflections and details you wouldn't get by just covering the screen with something. Please futher explain, fine sir =D

If you're kind, you can help me through the process by looking at the video at this link:

https://videos.pexels.com/videos/android-phone-swipe-scroll-gesture-339