We’ve all been there: you open up an asset folder hoping for a clean vector, only to find a low-res PNG staring back at you. If you were planning a slick line reveal animation, that flat block of pixels feels like a total roadblock.
The instinct is usually to groan, fire up Illustrator, and spend the next hour manually redrawing the whole mark with the pen tool. But honestly, you can skip that headache entirely and pull it off right inside After Effects.
The trick is making AE treat those raster pixels like paths using Auto Trace. It scans the transparency boundaries, drops native vector masks right onto the layer, and lets you drive a clean stroke along the edges. It spares you endless manual pen-tooling, and once you get the steps down, you can turn a crunchy bitmap logo into a fluid, animated line reveal in literally five minutes flat.
Setting Up Your Comp and Asset
First off, let’s get the timeline ready to roll. Pop open a fresh comp - standard 1920x1080 works great - and give yourself around 10 to 20 seconds of breathing room.
A plain black background is ideal here so you can actually keep track of your bright stroke lines as they draw on. Once that’s set, drop your PNG logo right onto the timeline.
Just make sure the artwork is sitting on a clean, transparent background. If the client sent a logo slapped onto a solid white or black box, AE won’t know where the graphic ends, and it'll just trace the outer square edge of the bounding frame instead of the actual design.
Before touching any tools, make a quick safety copy. Grab your logo layer, hit Ctrl + D (or Command + D on a Mac) to duplicate it, and click the eye icon to hide that bottom layer for a bit. We're going to use it down the line to smoothly fade the real logo in once the strokes finish.
Grabbing Masks with Auto Trace
Select that top visible layer and head up to the main menu: Layer > Auto Trace. This is the workhorse feature that converts pixel silhouettes into editable vector masks. A setup window will pop up with a few parameters, but the main slider you want to pay attention to is Tolerance.
Basically, Tolerance decides how tightly AE hugs the pixelated edges of your artwork:
High Tolerance: Generates fewer anchor points, but it tends to round off crisp corners and soften smaller details.
Low Tolerance: Sticks to every single pixel step, capturing sharp details at the cost of way more anchor points.
If your logo has detailed lettering or intricate icons, lean toward a lower tolerance so the geometry stays true, but don't drag it down to rock bottom or your layer will get weighed down with thousands of messy points. Double-check that Current Frame is ticked, hit OK, and you’ll see crisp yellow mask paths hugging your graphic.
Setting Up the Stroke Effect
Now that we’ve got real paths to play with, we can add the actual line effect. With your traced layer selected, go up to Effect > Generate > Stroke.
Over in the Effect Controls panel, make sure you immediately check the box for All Masks. If you leave this unticked, the stroke only runs along whatever mask happens to be listed first, leaving the rest of the logo completely blank.
Here’s the step people almost always trip over: change the Paint Style dropdown from On Original Image to On Transparent. If you leave it on the default, the stroke just paints right over the top of the color artwork, ruining the illusion. Switching to On Transparent isolates the stroke lines by themselves against your comp background.
Before you touch the stroke width, push Hardness up to 100% so the edges are razor-sharp instead of fuzzy. Then dial your Brush Size down to around 3 or 4 - just thick enough to hold clear visual weight without looking clunky.
Animating the Line Reveal
Getting the lines to trace out on screen is straightforward - we’re just going to keyframe the End value inside the Stroke settings.
Park your playhead right at the start of your comp (0:00).
Drop the End parameter down to 0%.
Click the stopwatch next to it to lock in your first keyframe.
Scrub the playhead forward to around the 2-second mark.
Crank that End value up to 100%.
Tap the spacebar to give it a spin. You’ll see the outlines sketch on cleanly from start to finish.
The mechanic works, but right now it feels stiff and mechanical because the timing is strictly linear. Let’s dial in the motion.
Dialing In the Motion and Feel
Linear keyframes always look a little robotic, so let’s give them some weight. Highlight both keyframes you just laid down and hit F9 to toggle on Easy Ease, which immediately rounds off the start and stop speeds.
To make it look like actual design work, jump into the Graph Editor. Pull the Bezier influence handles to give the timing curve some personality - a ramp that starts deliberate, rushes through the middle, and glides gently into the finish gives line animations a really refined, polished feel.
If you want an extra layer of production value, search for CC Force Motion Blur in your Effects & Presets panel and toss it onto the layer. Unlike standard comp blur, this analyzes the actual movement of the stroke tip and adds realistic shutter smearing along the path, which makes the whole drawing action feel silky smooth.
Dropping in the Final Reveal
The line animation is looking solid, but eventually you want the actual branded logo to take over. That’s where the safety copy we stashed earlier comes into play.
Scroll down to that hidden bottom layer, turn the eyeball back on, and tap T to bring up its Opacity.
Move your timeline cursor to where the stroke wraps up (right around 2 seconds).
Set the layer’s Opacity to 0% and hit the stopwatch.
Step forward about 10 to 20 frames.
Bring the Opacity back up to 100%.
As the stroke outlines lock into place, the real artwork softly fades in underneath to complete the lockup. It saves you from having to email the client asking for clean assets, and you still end up delivering a sleek, intentional motion piece off an ordinary PNG. If they ever do send over proper vectors instead, reading up on what an EPS file is makes it easy to decide whether to flatten it out first or keep the vectors live inside your Illustrator-to-AE pipeline.