Projector 3D Test Patterns

Good 3D depends on one thing: keeping the left and right images strictly apart so each eye sees only what it should. When that separation leaks, you get ghosting — a faint double image — and the depth illusion falls apart. These five patterns let you verify the whole chain on a projector. Anaglyph offset boxes confirm red-cyan glasses are working, the left/right field shows whether each eye is fed the correct frame, a depth gradient checks the sense of near and far, the crosstalk pattern hunts for ghost leakage to the wrong eye, and a convergence grid confirms the two images line up. Wear your glasses and each pattern should look exactly as described.

How to use

1
Match the pattern to your glasses

Red-cyan paper glasses use the anaglyph pattern; active-shutter or polarised glasses use separation, crosstalk and convergence.

2
Put the glasses on

View each pattern through the glasses, not with the naked eye, so you judge what your eyes actually receive in 3D.

3
Hunt for ghosting

On the crosstalk pattern, the shape meant for the other eye should be invisible. A faint double means leakage to fix.

4
Check convergence and depth

The convergence grids should overlap cleanly, and the depth gradient should read as a smooth near-to-far slope.

Prove each eye sees only its own image, with no ghosting

Active-shutter or polarised 3D? Use L/R separation, crosstalk and convergence patterns. Red-cyan anaglyph 3D? Use the anaglyph pattern. Crosstalk = ghost image visible to the wrong eye — should be invisible on a properly calibrated 3D projector.

Features

Crosstalk ghost hunt
A bright shape meant for one eye, blanked for the other — any ghost you can see through the closed lens is leakage you want to minimise.
Left / right separation
Distinct content for each eye verifies the projector and glasses are feeding the correct frame to the correct side, not swapped.
Anaglyph and active support
Red-cyan boxes for paper anaglyph glasses, plus separation and convergence patterns for active-shutter and polarised systems.
Convergence grid
Overlaid left/right grids reveal misalignment that makes 3D tiring — the lines should sit on top of each other through the glasses.

Why this 3D test

Ghosting is the single biggest thing that ruins projector 3D, and a regular movie makes it hard to tell whether the fault is the projector, the glasses or the source. These patterns isolate each link: anaglyph for paper glasses, left/right and convergence for active and polarised rigs, and a dedicated crosstalk shape that makes leakage to the wrong eye impossible to miss. Everything is designed to be viewed through your glasses on the projected image, so you judge the 3D you actually get. It runs full-screen in the browser with no install, ready whenever you set up a 3D session.

FAQ

What exactly is crosstalk?

In active 3D the right lens should be fully dark while the left frame is on screen, and vice versa. Imperfect shutter timing or slow panel persistence lets a little of the wrong frame through, producing a ghostly double image. Less is better; above roughly two percent it becomes obvious in dark, high-contrast scenes.

My anaglyph image looks flat or doubled

Check the glasses are red over the left eye and cyan over the right, the standard orientation — reversed glasses kill the effect, so just rotate them. If the projected reds and cyans look off-colour, set white balance first so the filters can cancel cleanly.

Why do I see double images with active-shutter glasses?

Either the glasses lost sync with the projector — re-pair or replace the battery — or panel persistence is too high for clean separation. Lowering contrast and brightness reduces how visible the residual ghost is, though some budget 3D projectors cannot eliminate it entirely.

The left and right look swapped

Some projectors and players have a "swap eyes" or "L/R invert" setting. If foreground objects look pushed behind the screen instead of in front, toggle that option and re-check the depth and separation patterns.

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Who is this tool for?
📽️ Projector Owners
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