Vacation Stripes: Drawing Simple Masks in After Effects
Master After Effects Mask Animation and Visual Composition
Tutorial Scope & Components
Exercise Preview
Key Skills You'll Master
Vector Shape Drawing
Learn to draw masks from scratch using After Effects' built-in vector shape tools for precise control.
Animation Timing
Master the intricacies of timing sequences and customizing eases for professional-looking transitions.
Project Integration
Import multiple After Effects projects and create seamless audio and video fades for polished results.
On the Desktop, navigate to Class Files > After Effects Level 2 Class > Vacation Stripes > Finished Clips and double–click Vacation-Stripes-Drawing-Masks.mov.
Play the video and analyze the sophisticated entrance animation sequence. Notice how each element is carefully choreographed:
- While the motorboat video plays, three horizontal stripes execute a precise left-to-right wipe, progressively covering the entire frame. This black and white freeze frame is strategically divided into three masked sections.
- The timing is crucial: after the topmost stripe reaches approximately 3⁄4 of its journey across the frame, three white rectangles and accompanying text elements make their entrance.
- The three rectangles strategically cover most of the freeze frame, creating a visual hierarchy that draws the viewer's attention to the focal point—the aerial view of the motorboat.
- Approximately one second after the color video transitions in, the rectangles begin their exit movement to the right.
- Pay attention to the staggered timing: the middle white rectangle containing the "12 noon" text initiates its movement last, with the text remaining perfectly parented to its rectangle throughout the animation.
Study this reference video multiple times—we'll be meticulously recreating this professional-grade animation. Keep it accessible for reference throughout the exercise, as the timing and movement relationships are critical to achieving the polished final result.
Project Setup Process
Save Current Work
Save and close any open After Effects projects to prepare for the new exercise
Open Base Project
Navigate to the Finished AE Projects folder and open Island Vacation-Ready for Drawing Masks.aep
Save With New Name
Use Save As to rename the file with your name and save it in the Vacation Stripes folder
Transitioning to the 12 Noon Scene
Now we'll begin constructing the technical foundation for our animated sequence, starting with the precise placement of our source materials:
Switch to After Effects, where yourname-Island Vacation.aep should be open and ready for editing.
In the Timeline, ensure you're working in the Vacation-MAIN tab—this is our master composition where all elements come together.
Strategic timing is essential for smooth transitions. We want the three black and white stripes to begin their on-screen animation approximately one second before the motorboat clip concludes. Move the playhead to 5;15.
Insert couple-BW.jpg (our next black and white freeze frame) into the Vacation-MAIN tab at exactly 5;15 using this precise technique:
- From the Project panel's Assets > Stills folder, drag couple-BW.jpg toward the right side of the Timeline (the area containing the colored layer bars). Don't release yet.
- Position your mouse over the area between the audio and [01-Trans to Motorboat-PC] layers until you see a blue insertion line appear between layers. Notice that a secondary playhead appears, allowing for precise timing placement.
- Continue dragging couple-BW.jpg and when the secondary playhead approaches 5;15 (visible on the Timeline's left side), hold Shift to snap to the exact frame.
- Release the mouse to complete the placement.
Repeat this precise placement technique: go to the Project panel's Imported AEPs > Text Cards.aep folder and drag 02-12noon-PC to the Timeline below the audio layer, starting at 5;15.
Timeline PrecisionThe stripes should start moving on-screen about a second before the motorboat clip ends. Use the Shift key while dragging to snap layers to the exact 5;15 timecode for perfect alignment.
Select both new layers by clicking on the [couple-BW.jpg] layer and Shift–clicking on [02-12noon-PC] to create a multiple selection.
Maintain organizational clarity by assigning a distinctive layer color. Click on the colored square to the left of one of the layer numbers and choose Blue from the color menu.
Clear your selection by going to Edit > Deselect All or pressing Cmd–Shift–A (Mac) or Ctrl–Shift–A (Windows).
Double–click the [02-12noon-PC] layer to open this pre-composition in a new Timeline tab, revealing its internal structure.
We need to relocate the three white rectangle layers to our main composition for independent animation control. Execute this transfer carefully:
- Click on white rectangle 1 and Shift–click on white rectangle 3 to select all three rectangle layers.
- Copy the layers using Cmd–C (Mac) or Ctrl–C (Windows).
- Disable their visibility in this pre-comp by clicking any eye
icon to the left of the selected layer names. This prevents visual duplication since we'll be animating them in the main composition.
Return to our master composition by clicking the Vacation-MAIN tab at the top left of the Timeline.
In the master composition's Timeline, select the [couple-BW.jpg] layer to establish the paste destination—the copied layers will appear above this selected layer.
Paste the three rectangle shape layers using Cmd–V (Mac) or Ctrl–V (Windows).
With the three layers still selected, click on the In column timecode to access the timing control.
In the Layer In Time dialog, set the value to 515 and click OK to align their start time with our other elements.
Deselect everything by pressing Cmd–Shift–A (Mac) or Ctrl–Shift–A (Windows).
Create a parent-child relationship to ensure the text moves with its associated rectangle. In the [02-12noon-PC] layer, locate the Parent & Link dropdown menu on the right and change it from "None" to 4. white rectangle 2. This parenting relationship is fundamental to maintaining cohesive movement in professional animations.
Layer Timing Correction
Select Problem Layers
Click on the first layer, then Shift-click on additional layers that need timing adjustment
Adjust In Column
Click on the In timecode, change it to 5;15, and click OK to set precise timing
Color Code Organization
Choose Blue color for the new layers to maintain visual organization in the timeline
Drawing Masks Using After Effects' Vector Shape Tools
While preparing masks in Adobe Illustrator provides maximum control and precision—especially for complex shapes—After Effects' built-in vector shape tools are perfectly suited for creating clean, simple geometric masks. For our horizontal stripe design, After Effects' native tools will deliver professional results while maintaining an efficient workflow.
We'll use the existing white rectangle layers as our alignment guides, ensuring pixel-perfect registration between the mask shapes and the overlaying elements.
From the Tools panel at the top of the interface, select the Rectangle tool
.CRITICAL: Vector shape tools like the Rectangle tool can create either a new mask (applied to an existing layer) or a new shape layer (a standalone vector object). To draw a mask, you must first select the target layer. If no layers are selected, After Effects will create a new shape layer instead—a common mistake that can disrupt your layer organization.
To create our mask, go to the Timeline and select the [couple-BW.jpg] layer—this is the layer we want to mask.
Maximize your workspace efficiency by expanding the Composition viewing panel to fill the entire screen. Position your cursor anywhere inside the Composition panel and press the tilde (
~) key (located below the Esc key).Draw your first rectangle over the top section of the image, carefully aligning the bottom edge with the bottom edge of white rectangle 1. Precision here is crucial for a professional result.
Fine-tune the positioning by zooming in as needed and using the Arrow keys for pixel-level adjustments—this level of precision distinguishes professional work from amateur attempts.
Create the second rectangle on the same layer, aligning it precisely with white rectangle 2. As shown below, ensure the top edge slightly overlaps with the first rectangle you just drew—this overlap prevents any potential gaps during animation.
Draw the third rectangle aligned to the bottom white rectangle, maintaining the same overlapping technique with the rectangle above it. This systematic overlapping ensures seamless coverage throughout the animation sequence.
Return to normal view by pressing the tilde (
~) key again.Switch back to the Selection tool
in the Toolbox to exit drawing mode.
Vector shape tools can create either masks or shape layers. To draw a mask, you must select the target layer first. If no layers are selected, you'll create a new shape layer instead.
Mask Drawing Process
Select Rectangle Tool
Choose the Rectangle tool from the Tools panel and ensure the target layer is selected
Expand Workspace
Press the tilde key to maximize the Composition panel for better precision
Draw Aligned Rectangles
Create three overlapping rectangles aligned with the white rectangle guides
Animating the Freeze-Frame Stripes
To achieve independent control over each stripe's animation timing—essential for creating the sophisticated staggered effect—we need to separate our masks onto individual layers. This technique is standard practice in professional motion graphics workflows.
Begin by organizing your layers with descriptive names. Select the [couple-BW.jpg] layer and press Return (Mac) or Enter (Windows) to enter rename mode.
Type couple1 and press Return (Mac) or Enter (Windows) to confirm the new name.
Create duplicate layers for mask separation. With couple1 selected, go to Edit > Duplicate twice, resulting in three couple layers total.
Reveal the mask properties by selecting the couple1 layer, Shift–clicking on couple3 to select all three layers, then pressing the M key.
Clean up the mask assignments so each layer controls only one stripe. For each layer, Shift–click all the Mask properties to select them, then Cmd–click (Mac) or Ctrl–click (Windows) on the mask you want to preserve, and delete the unwanted masks. Your final configuration should be:
couple1: Retain only Mask 1 (delete Mask 2 and Mask 3) couple2: Retain only Mask 2 (delete Mask 1 and Mask 3) couple3: Retain only Mask 3 (delete Mask 1 and Mask 2) Collapse the couple layers to maintain Timeline clarity when the mask setup is complete.
Professional animators often work backwards when setting up position animations—it's more intuitive to start from the final position. Since we want the stripes to animate for exactly one second, move the playhead to 6;15.
We'll animate the top stripe first, as it leads the sequence in the final animation. Select the couple1 layer.
Press P to reveal the couple1 layer's Position property.
Ctrl–click (Mac) or Right–click (Windows) on the word Position and select Separate Dimensions. This separation allows independent control of X and Y movement, which is essential for our horizontal animation.
Click in an empty Timeline area to deselect both the separated properties.
Create the ending keyframe by clicking the stopwatch
next to X Position.Jump to the animation start point by pressing I, which moves the playhead to 5;15—when our transition begins.
Set the starting position by changing the X Position to –1,000, positioning the stripe completely off-screen to the left.
Apply professional easing to the end keyframe: Ctrl–click (Mac) or Right–click (Windows) on the second keyframe
and choose Keyframe Assistant > Easy Ease In.Fine-tune the easing curve: Ctrl–click (Mac) or Right–click (Windows) the second keyframe
again and select Keyframe Velocity.Under Incoming Velocity, set the Influence to 70% and click OK. This creates a more dramatic deceleration that feels natural and polished.
Before previewing, set up an efficient preview range. Move the playhead to approximately 5;00—slightly before the stripe animation begins.
Isolate the layer you're testing by clicking the Solo
switch for the couple1 layer.Set up the work area for focused previewing. On the gray bar below the seconds in the Timeline, click on the left blue tab (Work Area Start). As shown below, hold Shift and drag it to align with the current playhead position:
Preview your animation by pressing Spacebar. You should see a smooth, professionally eased entrance!
Return to full composition view by un-soloing the couple1 layer—click in its Solo column
again.Copy the animation data for efficiency: under couple1, click on the words X Position to select both keyframes.
Copy the keyframes using Edit > Copy or Cmd–C (Mac) / Ctrl–C (Windows).
Apply the staggered timing that creates professional visual flow. Paste (Cmd–V (Mac) or Ctrl–V (Windows)) the keyframes at these specific timecodes:
5;17: Paste onto the couple2 layer, then press U to reveal the keyframes. 5;21: Paste onto the couple3 layer, then press U to reveal the keyframes. The deliberate delay in the couple3 layer's timing creates a visual deceleration that signals the transition's conclusion—a subtle but important detail in professional animation.
Animation Sequence Timing
Stripe 1 Animation
Top stripe begins moving from off-screen left
Stripe 2 Animation
Middle stripe starts with slight delay
Stripe 3 Animation
Bottom stripe completes the sequence
Finishing the Entrance Sequence: the White Rectangles
Now we'll animate the white rectangles to create a cohesive entrance sequence that complements our stripe animation. The timing relationships between these elements are crucial for maintaining visual flow.
Maintain visual hierarchy by starting with the top element. Select white rectangle 1 and press the P key to reveal its Position property.
Ctrl–click (Mac) or Right–click (Windows) on the word Position and select Separate Dimensions for independent X and Y control.
Click in an empty Timeline area to deselect both separated properties.
Set the ending position first by moving the playhead to 7;00—this completes our 1-second transition and aligns with the freeze frame animation timing.
Create the ending keyframe by clicking the stopwatch
next to X Position.For seamless integration, this transition should begin halfway through the freeze frame animation sequence. Move the playhead to 6;00.
Set the starting position by changing the X Position to –280, placing the rectangle completely off-screen to the left (matching our freeze frame animation approach).
Apply consistent easing: Ctrl–click (Mac) or Right–click (Windows) on the second keyframe
and choose Keyframe Assistant > Easy Ease In.Match the easing characteristics of the freeze frame stripes: Ctrl–click (Mac) or Right–click (Windows) the second keyframe
again and select Keyframe Velocity.Under Incoming Velocity, set the Influence to 70% (matching our stripe animation values) and click OK.
Prevent animation quirks by applying a hold keyframe to the first position. When identical keyframes are adjacent, After Effects sometimes creates unwanted interpolation between them. Go to Animation > Toggle Hold Keyframe to ensure the value remains static before the next animation phase.
Notice the new hold keyframe
combines an Easy Ease shape 
on the left with a hold keyframe on the right—this hybrid shape indicates the keyframe will maintain its value until the next keyframe begins its interpolation.
Use Toggle Hold Keyframe to prevent unwanted 'jogs' between identical keyframes. The hold keyframe maintains the value until a different keyframe is reached.
Key Takeaways