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How to remove track marks from green screen (see example)

Explorer ,
May 20, 2020

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Hi,
Got this result from using Mocha for the first time 😄
https://www.dropbox.com/s/9u8fiyp5moxq9no/GettyImages-925126630_HD.mp4?dl=0

BUT how do you remove the x marks cluttering the entire screen??

I have no idea of what I could do here. I have the Red Giant suite FYI.

Cheers!

Adobe Community Professional
Correct answer by Rick Gerard | Adobe Community Professional

Rather than create a complete tutorial I took a few minutes to show one process for replacing the screen on a phone when there are obnoxious tracking markers on the phone. I assume you already know how to set up an efficient track in Mocha AE using multiple splines to eliminate errors caused by the moving fingers and verify the track by showing the surface, adding an image like the 8X8 grid, then saving the tracking data in the footage layer so it can be used later.

Screenshot_2020-05-28 16.31.53_zngSbo.png

The next step is to look at the problem of the black tracking markers. Because they are black and there is not a lot of black in the fingers as they move over the tracking markers Extract from the Keying effects, plus some Gaussian blur plus the Black and White filter give us a good clean black and white screen that we can use as a luma matte to get rid of the black tracking marks.

Screenshot_2020-05-28 16.27.47_4m0ylA.png

Duplicating the extract layer, setting the blend mode of the duplicates to Multiply, increasing the blur for each copy and adding a white solid with an animated mask above and a white solid below give us a clean black and white layer we can use as a luma matte with the ability to refine the edge by the number of copies and the amount of blur. For this low-quality footage, it took 17 copies to generate a good track matte for the markers.

Screenshot_2020-05-28 16.30.00_m5yOSw.png

Drop that Track Matte comp into the Main comp above the footage you need to key and set it as a Luma Track Matte then fine-tuning Keylight removes the green and the black marks. In this comp, I only had to set 6 keyframes for the mask in the top white solid to get a really good matte.

Screenshot_2020-05-28 16.31.20_RzxU2U.png

The final composite includes the Track Matte, some markers that tell me when the screen should move, a few time remapping keyframes to fix timing errors, and the comp is now ready for the final color grading.

 

If there are tracking markers on footage on greenscreen footage it is almost always more efficient to try and figure out a procedural way to create a matte for those markers. In this case, Extract was the most efficient tool. If the shot was different you may have had to do some additional roto over the fingers or use different techniques for removing the track marks. I had to do one a few years ago where they put blue track markers on a green screen so 2 copies of Keylight with some outside masks did the trick. For screen replacements, I always prefer that the phone just has a medium to dark gray or colored screen. Then creating the track matte is the easiest part and you can pick up reflections from the screen to add realism. A very short animated gif that shows the first test render. Timing needs improvement but the whole project and writing the post took me only about 15 minutes. I did it while I was having lunch.

motionTrack.gif

Did you notice that I put this thread on the screen?

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How to remove track marks from green screen (see example)

Explorer ,
May 20, 2020

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Hi,
Got this result from using Mocha for the first time 😄
https://www.dropbox.com/s/9u8fiyp5moxq9no/GettyImages-925126630_HD.mp4?dl=0

BUT how do you remove the x marks cluttering the entire screen??

I have no idea of what I could do here. I have the Red Giant suite FYI.

Cheers!

Adobe Community Professional
Correct answer by Rick Gerard | Adobe Community Professional

Rather than create a complete tutorial I took a few minutes to show one process for replacing the screen on a phone when there are obnoxious tracking markers on the phone. I assume you already know how to set up an efficient track in Mocha AE using multiple splines to eliminate errors caused by the moving fingers and verify the track by showing the surface, adding an image like the 8X8 grid, then saving the tracking data in the footage layer so it can be used later.

Screenshot_2020-05-28 16.31.53_zngSbo.png

The next step is to look at the problem of the black tracking markers. Because they are black and there is not a lot of black in the fingers as they move over the tracking markers Extract from the Keying effects, plus some Gaussian blur plus the Black and White filter give us a good clean black and white screen that we can use as a luma matte to get rid of the black tracking marks.

Screenshot_2020-05-28 16.27.47_4m0ylA.png

Duplicating the extract layer, setting the blend mode of the duplicates to Multiply, increasing the blur for each copy and adding a white solid with an animated mask above and a white solid below give us a clean black and white layer we can use as a luma matte with the ability to refine the edge by the number of copies and the amount of blur. For this low-quality footage, it took 17 copies to generate a good track matte for the markers.

Screenshot_2020-05-28 16.30.00_m5yOSw.png

Drop that Track Matte comp into the Main comp above the footage you need to key and set it as a Luma Track Matte then fine-tuning Keylight removes the green and the black marks. In this comp, I only had to set 6 keyframes for the mask in the top white solid to get a really good matte.

Screenshot_2020-05-28 16.31.20_RzxU2U.png

The final composite includes the Track Matte, some markers that tell me when the screen should move, a few time remapping keyframes to fix timing errors, and the comp is now ready for the final color grading.

 

If there are tracking markers on footage on greenscreen footage it is almost always more efficient to try and figure out a procedural way to create a matte for those markers. In this case, Extract was the most efficient tool. If the shot was different you may have had to do some additional roto over the fingers or use different techniques for removing the track marks. I had to do one a few years ago where they put blue track markers on a green screen so 2 copies of Keylight with some outside masks did the trick. For screen replacements, I always prefer that the phone just has a medium to dark gray or colored screen. Then creating the track matte is the easiest part and you can pick up reflections from the screen to add realism. A very short animated gif that shows the first test render. Timing needs improvement but the whole project and writing the post took me only about 15 minutes. I did it while I was having lunch.

motionTrack.gif

Did you notice that I put this thread on the screen?

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May 20, 2020 0
Adobe Community Professional ,
May 20, 2020

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That's very good for a first attempt.
Mocha's BorisFX Site has lots of excellent tutorials - this should get you going -
https://borisfx.com/videos/mocha-pro-2019-whats-new-/

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May 20, 2020 0
Explorer ,
May 21, 2020

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Hi Roland,

Thats for the link - it has the finger issue explained here!

Thanks!

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May 21, 2020 0
Explorer ,
May 27, 2020

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Here is my second version based off of both of your comments - BUT there is still a PROBLEM.

How do I get rid of those pesky track marks? I need to green screen the mask to get those round corners around the screen - dont I?

How do I mask the round corners of the screen - WITHOUT getting the track marks?

https://www.dropbox.com/s/gcm383xg38m6v51/mocha_test_v2.mp4?dl=0

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May 27, 2020 0
Adobe Community Professional ,
May 20, 2020

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I am guessing that you are using Keylight to remove the green background. Forget keylight and put your replacement screen on top of the phone. When that is done, duplicate the footage layer and put it on top of the replacement screen. Then do a simple loose animated mask around the finger and apply Keylight to clean up the matte.

 

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May 20, 2020 0
Explorer ,
May 21, 2020

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Hi Rick,

Thanks I'll try that. 😄

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May 21, 2020 0
Explorer ,
May 27, 2020

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Here is my second version based off of both of your comments - BUT there is still a PROBLEM.

How do I get rid of those pesky track marks? I need to green screen the mask to get those round corners around the screen - dont I?

How do I mask the round corners of the screen - WITHOUT getting the track marks?

https://www.dropbox.com/s/gcm383xg38m6v51/mocha_test_v2.mp4?dl=0

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May 27, 2020 0
Adobe Community Professional ,
May 28, 2020

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I don't have time to go into the details now but you have to stack up the mattes. You'll need one for the black X and another for the hand, and another for the phone. With the current versions of AE and any other compositing app that I am familiar with tracking markers like this are completely unnecessary. They have been for a long time. If that is stock footage you purchased then you are kind of stuck, but if you shot it or have the chance to shoot again it will probably save you a couple of hours.

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May 28, 2020 1
Adobe Community Professional ,
May 28, 2020

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Rather than create a complete tutorial I took a few minutes to show one process for replacing the screen on a phone when there are obnoxious tracking markers on the phone. I assume you already know how to set up an efficient track in Mocha AE using multiple splines to eliminate errors caused by the moving fingers and verify the track by showing the surface, adding an image like the 8X8 grid, then saving the tracking data in the footage layer so it can be used later.

Screenshot_2020-05-28 16.31.53_zngSbo.png

The next step is to look at the problem of the black tracking markers. Because they are black and there is not a lot of black in the fingers as they move over the tracking markers Extract from the Keying effects, plus some Gaussian blur plus the Black and White filter give us a good clean black and white screen that we can use as a luma matte to get rid of the black tracking marks.

Screenshot_2020-05-28 16.27.47_4m0ylA.png

Duplicating the extract layer, setting the blend mode of the duplicates to Multiply, increasing the blur for each copy and adding a white solid with an animated mask above and a white solid below give us a clean black and white layer we can use as a luma matte with the ability to refine the edge by the number of copies and the amount of blur. For this low-quality footage, it took 17 copies to generate a good track matte for the markers.

Screenshot_2020-05-28 16.30.00_m5yOSw.png

Drop that Track Matte comp into the Main comp above the footage you need to key and set it as a Luma Track Matte then fine-tuning Keylight removes the green and the black marks. In this comp, I only had to set 6 keyframes for the mask in the top white solid to get a really good matte.

Screenshot_2020-05-28 16.31.20_RzxU2U.png

The final composite includes the Track Matte, some markers that tell me when the screen should move, a few time remapping keyframes to fix timing errors, and the comp is now ready for the final color grading.

 

If there are tracking markers on footage on greenscreen footage it is almost always more efficient to try and figure out a procedural way to create a matte for those markers. In this case, Extract was the most efficient tool. If the shot was different you may have had to do some additional roto over the fingers or use different techniques for removing the track marks. I had to do one a few years ago where they put blue track markers on a green screen so 2 copies of Keylight with some outside masks did the trick. For screen replacements, I always prefer that the phone just has a medium to dark gray or colored screen. Then creating the track matte is the easiest part and you can pick up reflections from the screen to add realism. A very short animated gif that shows the first test render. Timing needs improvement but the whole project and writing the post took me only about 15 minutes. I did it while I was having lunch.

motionTrack.gif

Did you notice that I put this thread on the screen?

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May 28, 2020 2
Explorer ,
May 29, 2020

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I gotta say... This community is just freaking awesome. Thanks you so much for putting in the effort to help me! 😄

I will go through this very soon - and hopefully i will be a lot wiser 😄

And yes I noticed the screen content 😉

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May 29, 2020 0
josteger LATEST
Explorer ,
May 29, 2020

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Here is the final version. Thanks for the help! 🙂

https://www.dropbox.com/s/neyyk4iovxh16oi/preview.mp4?dl=0


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May 29, 2020 0