I've used apps in the past made specifically for this.

I'm not on an apple device anymore, but the android play store has an app called "motion tracking markers" that gives you tracking points all around the screen and allows you to shift the background color if you need a specific spill color on exterior objects.

I'm pretty sure there are apps similar to this for apple devices.

As for the content on the screen, I normally just make a precomp the size of the phone's screen and then composite that on top of what was already there. Not key and place underneath.

Reflections or glare I add back in as compositing/fx pass.

///Greg Balint
//Art Director / Motion Graphics Designer
/321.514.4839
delRAZOR.com/
   

On Jun 2, 2014 10:28 AM, "Roei Tzoref" <AE-List@media-motion.tv> wrote:

Hey y'all

I recently tracked different kind of Iphone and Ipads screen replacements

with different methods, and cant be sure whats the optimal way of preparing the shoot.

my question is:

do you use green on iphone and ipads where good reflections are needed to sell the shot?

my considerations are:

on one hand:

with green sticker -> better track and maybe easier roto, but you do have to remove it

and no reflections.

on the other hand:

without green sticker -> more rotoscoping, sometimes difficult track, but good reflections.

the way I decided doing it was with no green because mocha can track just with

the shapes and proportions and the green I get usually its just a pain to remove

and although helps me with the track, I do have to remove it and replace it. and

usually it doesn't help me with keying it because the shot is lit for the main action

and not the green inside. the problem is I got a shot with bright sun behind

and the track was very hard. a green would have at least help with the shear shift.

what do you recommend as the best course of action for iphones and ipads

and GUI screens in general (where you need the reflections)?

thanks