Office Man: Greenscreen Removal in Premiere Pro

Topics Covered in This Premiere Pro Tutorial:

Advanced Greenscreen Keying Techniques, Creating a Subsequence (Nesting), Adding Realistic Motion Blur

Exercise Preview

Exercise Overview

In this comprehensive exercise series, you'll master professional compositing techniques by creating a seamless video of a man rolling across an office environment. This project combines advanced greenscreen removal, sophisticated audio editing, and precise color correction using Premiere Pro's Lumetri Color workspace. You'll tackle real-world challenges that mirror professional post-production workflows, learning to key complex footage and apply motion effects that maintain cinematic quality. This exercise focuses specifically on achieving clean chromakey results and using transform effects to create believable movement across the frame.

Previewing the Final Video

1. Before diving into the technical work, let's examine the target result. Ensure your speakers are active or headphones are connected, as the audio design is integral to the final effect.

2. Navigate to Class Files > Premiere Pro Class > Office Man > Finished Movie on your Desktop and double-click office-man.mp4.

3. Analyze these key elements as you watch (review multiple times to catch all details):

   • The defocused office background creates depth and professional ambiance
   • The subject's movement from left to right appears natural and physically convincing
   • Spatial audio design places the rolling chair sound in the stereo field, moving from left to right over ambient office noise

Getting Started

We'll begin by setting up your workspace and examining the pre-configured project structure.

1. In Premiere Pro, navigate to File > Close All Projects to ensure a clean workspace.

2. Go to File > Open Project.

3. Navigate to Desktop > Class Files > Premiere Pro Class > Office Man and double-click OfficeMan-Start.prproj.

4. Immediately save your working copy by going to File > Save As. Name it yourname-OfficeMan.prproj and save it in the same Office Man folder.

5. Switch to the Editing workspace and reset to default layout for optimal panel arrangement.

6. Locate the pre-created NYCofficeman sequence. If it's not visible in the Timeline, double-click it in the Project panel to open it.

7. Examine the layer structure: you'll find an officeMan-edit.mov clip positioned on track V2.

8. Position the playhead over the clip to preview the greenscreen footage.

9. Click the eye icon next to V2 to temporarily hide this track, revealing the office background plate beneath. This demonstrates the compositing goal: seamlessly integrating the subject into the background environment.

10. Note the audio structure: separate tracks for ambient office tone and the chair's rolling sound effects, which you'll balance in later exercises.

Advanced Greenscreen Keying

Professional keying requires methodical approach and the right visual references. We'll start by creating optimal conditions for evaluating our key quality.

1. To accurately assess keying quality against complex backgrounds, we'll first establish a high-contrast reference. Drag officeMan-edit.mov from V2 up to track V3.

2. Toggle the visibility off for all video tracks (V1, V2, V3) to reveal Premiere's default black background.

3. Re-enable visibility for all tracks.

4. Create a contrasting background matte for keying evaluation. Click the New Item button at the bottom of the Project panel and select Color Matte.

5. In the New Color Matte dialog, accept the default settings and click OK.

6. The Color Picker opens. Enter #C30EEF in the hex field to create a vibrant magenta—this high-contrast color makes edge artifacts and transparency issues immediately visible. Click OK.

7. Name the matte Color Matte-Magenta in the dialog and click OK.

8. Drag Color Matte-Magenta from the Project panel to track V2, aligning its end point with the officeMan clip above.

9. Move the playhead to approximately 2;19 to center the actor in frame for optimal keying reference.

10. Open the Effects panel and search for ultra.

11. Drag Ultra Key onto the officeMan-edit.mov clip.
12. Switch to the Effect Controls panel to access the keying parameters.
13. Collapse the Motion and Opacity sections to focus on Ultra Key controls.

14. Click the eyedropper next to Key Color.

15. Hold Cmd (Mac) or Ctrl (Windows) and click in the green area to the right of the subject's head.

    Professional Tip: The modifier key activates the large eyedropper, which samples and averages multiple pixels—crucial for consistent keying results across varying lighting conditions.

    You should see immediate removal of most green background areas.

16. Change Output to Alpha Channel to view the matte in black and white—this reveals exactly what will be transparent (black) versus opaque (white).

17. Click the color box next to Key Color to open the Color Picker.

18. Enter #4A7D5C—a carefully calibrated green value that works optimally with this footage's lighting conditions.

19. Click OK to apply the refined key color.

20. Change Setting to Aggressive for more thorough green removal.

21. Expand Matte Generation and apply these professionally-tuned values:

    • Transparency: 46 (controls overall matte density)
    • Highlight: 30 (manages bright green areas)
    • Shadow: 72 (handles darker green regions)
    • Tolerance: 90 (expands color range acceptance)
    • Pedestal: 90 (sets minimum transparency threshold)

    These adjustments create superior matte contrast. For comprehensive understanding of Ultra Key parameters, reference Adobe's official documentation at: tinyurl.com/keying-effects

22. Collapse the Matte Generation section.

23. Expand Matte Cleanup and configure these refinement settings:

    • Choke: 10 (tightens matte edges)
    • Soften: 10 (reduces harsh edge transitions)
    • Contrast: 100 (maximizes matte definition)
    • Mid Point: 35 (balances edge softness)

24. Return Output to Composite to view the final keyed result.

    The key should now be significantly cleaner, though you may notice persistent green remnants in the upper and lower right corners.

    Professional Note: Set your Playback Resolution to Full and Select Zoom Level to 100% in the Program Monitor for accurate keying assessment—lower resolution previews can mask edge problems that become visible in final output.

25. To address remaining problem areas, we'll create a precision opacity mask. Collapse Ultra Key in the Effect Controls.
26. Expand Opacity to access masking tools.
27. Click Create 4-point polygon mask to add geometric masking.

28. A rectangular mask frame appears in the Program Monitor. Adjust the control points to exclude problematic edge areas while preserving all subject detail.

29. Drag the points to create a shape similar to this reference (add points by clicking anywhere on the blue mask outline):

    

30. Scrub through the entire sequence to verify the mask doesn't crop important subject areas during movement.

    Around timecode 2;13, you may still detect shadow contamination in the lower right corner.

31. To refine the mask, click the word Mask in the Effect Controls to re-display the control points for adjustment.

32. Zoom out to 25% to see the full frame boundaries and avoid accidental cropping.

33. Add an additional control point to the right of the chair at the bottom edge, then adjust the lower right corner point upward to create this optimized shape:

    

34. Return zoom to Fit for normal viewing.

35. Perform a final scrub-through to confirm no subject clipping occurs, making micro-adjustments as needed.

    Remember: Click the word Mask in Effect Controls to toggle mask visibility for precise adjustments.

36. The keying phase is complete. Motion blur and movement will naturally soften any remaining minor imperfections. Delete the reference matte by selecting Color Matte-Magenta in the Timeline and pressing Delete.

37. Organize your Timeline by moving officeMan-edit.mov down to track V2.

Moving the Actor Across Screen

Now we'll create the illusion of natural movement using keyframe animation. Professional motion requires careful attention to timing and realistic motion blur.

1. Position the playhead at the first frame of officeMan-edit.mov at 1:09 and select the clip.

2. In Effect Controls, collapse other sections and expand Motion to access position controls.

3. Set Position to -457, 540 to place the subject completely off-screen left, creating a natural entrance point.

4. Click the stopwatch next to Position to enable keyframing and set the first position keyframe.

5. Move the playhead to the clip's final frame at 3:27.

6. Update Position to 2356, 540 to complete the left-to-right movement arc.

7. Scrub through to preview the motion. The movement is technically correct but lacks the natural motion blur that would occur with actual camera movement or fast subject motion.

   Technical Note: Unlike other motion graphics applications, Premiere Pro doesn't automatically generate motion blur from position animations in the Motion panel. Professional-quality movement requires the Transform effect.

8. Open the Effects panel and search for transform.

9. Locate Transform under the Distort category and drag it onto officeMan-edit.mov in the Timeline.

10. We'll replicate the motion keyframes using Transform's superior rendering capabilities. Ensure the playhead is at 1:09.

11. In Effect Controls, under the Transform section, click the Position stopwatch to enable keyframing.

12. Enter Position values of -457, 540.

13. Advance to the final frame at 3:27.

14. Set the end Position to 2356, 540.

15. The original Motion keyframes are now redundant. Expand the Motion section.

16. Click the stopwatch next to Position in the Motion section to delete the keyframes.

17. Confirm keyframe deletion by clicking OK in the warning dialog.

18. Click the Reset Parameter button to the right of Position in the Motion section to restore default center positioning.

19. Scrub through the timeline. The result appears severely corrupted due to effect processing order.

20. The issue occurs because Transform processes after the opacity mask, creating the visual corruption. In Effect Controls, notice Transform appears below Motion—this indicates processing order, and we need Transform to process before the mask.

21. The solution requires converting this clip into a subsequence (nested sequence) to establish proper effect hierarchy.

Creating a Subsequence (Nesting) & Adding Motion Blur

Subsequences (nested sequences) are powerful tools for managing effect processing order and creating reusable compositions. This technique is essential for complex post-production workflows.

1. Ctrl-click (Mac) or Right-click (Windows) the officeMan-edit.mov clip on V2 and select Nest.

   Technical Explanation: Nesting converts the clip and all its effects into a self-contained subsequence, then places that subsequence back into your timeline as a single manageable unit.

2. Name the nested sequence NYCofficeman-sub and click OK.
3. We need to transfer the Transform effect from the nested clip to the subsequence itself. Double-click NYCofficeman-sub on track V2 to enter the nested timeline.
4. Select the officeMan-edit.mov clip within the nested sequence.
5. In Effect Controls, click the word Transform to select the entire effect including its keyframe data.
6. Go to Edit > Cut to remove the effect while preserving keyframe information.

7. Close the NYCofficeman-sub tab to return to the main NYCofficeman timeline.

   You should now see the main sequence timeline with the nested subsequence as a single clip.

8. Select the NYCofficeman-sub clip on track V2.
9. Go to Edit > Paste to apply the Transform effect with its keyframes to the subsequence.
10. Scrub through the sequence to verify the motion works correctly without visual corruption.
11. To add professional motion blur, expand the Transform controls in Effect Controls.

12. Locate Shutter Angle and change the value to 100.

    Professional Insight: Shutter Angle simulates camera motion blur—higher values create more pronounced blur effect. 100 degrees provides natural movement blur that matches typical cinematography.

13. Play through the complete sequence to observe the realistic motion blur during movement.

14. Save your work with File > Save and keep this project open for the next exercise phase.

    Workflow Summary: We used subsequence nesting to solve effect processing order issues. Premiere calculates effects hierarchically, so the Transform effect initially processed after the Opacity Mask, causing corruption. By nesting the keyed footage and applying Transform to the subsequence, we forced the movement calculation to occur last in the processing chain. This approach treats the nested content as pre-rendered footage, allowing proper effect layering.