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How do I mask out a logo on a moving and sometimes obscured object??

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Josh BlanchardHow do I mask out a logo on a moving and sometimes obscured object??
by on Oct 16, 2016 at 1:15:02 am

So I have a problem.

I'm working on a video for a client and I need to mask out a logo in the center of a metal drain. It's not great quality and its being spun into a socket by hand so the hand is blocking the logo ever 10 frames or so. Now I've been going frame by frame using the clone tool to mask out the logo but this is proving to be a extremely long and tedious task. I have decent experience with after effects but this one's got me stumped. I would be very grateful for any advice given. Here's a screen capture of what it looks like.



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Roei TzorefRe: How do I mask out a logo on a moving and sometimes obscured object??
by on Oct 16, 2016 at 8:50:19 pm
Last Edited By Roei Tzoref on Oct 17, 2016 at 9:51:11 am

4 step process: Tracking, Creating a Clean Plate, Rotoscoping, Color Matching. welcome to the wonderful world of compositing.

Tracking
you should track the moving object either by perspective of transform (depends on the movement in the shot) and apply the track data to the clean patch you create later (step 2) this is also called "clean plate". if it's only rotation,position,scale in which the object moves, you can then attach a patch to that null with a track data so it moves like your object. if it's perspective movement you apply the track data directly to the layer with corner pin effect when you paste the track date from mocha. check the adobe resource files for tracking workflows https://helpx.adobe.com/after-effects/using/tracking-stabilizing-motion-cs5...

Creating a Clean Plate
Option#1:
you can use Ae stamp tool for this:
1. click twice on the video to open the layer window and use the stamp brush. adjust size and feather and in the paint panel use constant frame and lock source time. this will create a still patch for the duration of the shot.
2. go back to the composition window and duplicate your footage. set the paint effect for the duplicate to "paint on transparent" and delete it from the original. now you have a layer with a patch on transparent background, while the other layer is the original footage.

option #2:
sometimes the paint process is too complex and you need more tools like Photoshop has. (content aware for example) so:
1. export a still frame from your video: Composition->save frame as-> file. this will create a PSD from your video.
2. open the file in photoshop and clean the area you want
3. import the file back to Ae.
4. mask just the part you want

now you need to attach the patch layer to a null with the tracking data.

Rotoscoping
you create a duplicate of your video and rotoscope your obscuring object from the patch. you can try using rotobrush: https://helpx.adobe.com/after-effects/using/roto-brush-refine-matte.html or manually: https://helpx.adobe.com/after-effects/using/animating-shape-paths-masks.htm...

Color matching
depending on the lighting changes you may have to adjust the exposure for your patch to match the background. you can do this with any of the Color Correction effects. you may need to add grain too.

That's it!

Roei Tzoref
After Effects Artist & Instructor
♫ Ae Blues Tutorials


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Josh BlanchardRe: How do I mask out a logo on a moving and sometimes obscured object??
by on Oct 17, 2016 at 5:55:09 pm

This is perfect. Thanks for all of this! I masked out an edited still but never thought to edit the mask with color correction to make it match. That was the missing piece of the puzzle. Still a pain, especially tracking something that is obscured a quarter of the time, but like you said, its the "wonderful world of compositing". I appreciate the well worded and detailed response! Thanks!


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Roei TzorefRe: How do I mask out a logo on a moving and sometimes obscured object??
by on Oct 17, 2016 at 8:16:12 pm

Great! glad to help :)

Roei Tzoref
After Effects Artist & Instructor
♫ Ae Blues Tutorials


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