Projector Test Pattern
Full-screen test patterns for setting up a home theater, classroom or office projector: a focus grid with star targets, keystone and geometry lines, color bars, black and white level steps, convergence grids and 16:9, 4:3 and 2.35:1 aspect frames. Download any pattern as a PNG to play from a USB stick or media player.
Last updated:
Focus grid
Full screen: → Space or click = next, ← back, ↑ ↓ pattern, L labels, Esc exit. Swipe on touch screens.
How to use the Projector Test Pattern
- Connect the projector as a duplicate or main display at its native resolution and set browser zoom to 100%.
- Pick a pattern from the grid; the preview and tips show what to look for.
- Press Start full-screen pattern, then use the right arrow, space or a click for the next variant and up or down to switch patterns.
- Set up in order: position and keystone with the geometry pattern, then focus, then aspect frames, then brightness, contrast and color.
- No computer at the projector? Choose an image size and press Download PNG, then play the file from a USB stick or media player.
Projector setup order
Adjustments affect each other, so work from the physical setup to the picture settings. Doing focus before keystone, for example, means refocusing after every move.
| Step | Pattern | What to adjust | Done when |
|---|---|---|---|
| 1. Position | Keystone & geometry | Projector height, distance, level feet, lens shift, zoom | Edges are parallel, grid cells square, circles round |
| 2. Focus | Focus grid | Focus ring (and zoom, then refocus) | 1 px lines and star centers sharp, corners nearly as sharp |
| 3. Framing | Aspect ratio frames | Zoom, lens memory, screen masking | The frame for your screen touches all screen borders |
| 4. Black level | Brightness & contrast: Black level | Brightness (black level) | 1% to 2% squares just visible, background black |
| 5. White level | Brightness & contrast: White level | Contrast (white level) | 98% and 99% squares still visible |
| 6. Color | Color bars, Uniformity | Picture mode, color temperature, color and tint | Neutral grays, clean bars, no tinted areas |
| 7. Convergence | Convergence | Panel alignment (3LCD, LCoS, 3-chip only) | White lines with no colored fringes |
Common aspect ratios and their pixel sizes
The frame size is the largest rectangle of that shape that fits inside the signal. For a 16:9 source the height of a wider frame is width ÷ ratio, and the remaining rows become black bars split equally above and below.
| Aspect ratio | Typical use | Image area in 1920 × 1080 | Image area in 3840 × 2160 |
|---|---|---|---|
| 16:9 (1.78:1) | HD and 4K TV, streaming, most home theater screens | 1920 × 1080 | 3840 × 2160 |
| 1.85:1 | Flat theatrical films | 1920 × 1038 | 3840 × 2076 |
| 2.35:1 / 2.39:1 | Cinemascope films, scope screens | 1920 × 817 (803 for 2.39) | 3840 × 1634 (1607 for 2.39) |
| 16:10 (1.6:1) | Business and education projectors (WXGA, WUXGA) | 1728 × 1080 | 3456 × 2160 |
| 4:3 (1.33:1) | Older TV content, older classroom projectors | 1440 × 1080 | 2880 × 2160 |
Tips for sharper, more accurate projection
- Output the projector's native resolution and turn off overscan, so each pixel of the pattern maps to one projector pixel. The TV overscan test shows whether edges are being cut.
- Let a lamp projector warm up for about 10 minutes before focusing; the lens and image shift slightly as it heats.
- Focus at the screen, not from the projector: a phone camera zoomed in on the star target helps when the projector is ceiling mounted.
- Prefer optical lens shift over digital keystone, and set zoom before focus, because zooming changes focus on most lenses.
- Black levels depend on ambient light; set brightness in the lighting conditions you normally watch in.
Frequently asked questions
How do I focus a projector with a test pattern?
Open the focus grid in full screen and stand close enough to see the fine lines. Turn the focus ring slowly past the sharpest point and back until the thin grid lines and the center of the star target look crisp. Then check the corner stars. Slightly soft corners are normal for many lenses; one soft side usually means the projector is not square to the screen or the screen is not flat.
Should I use digital keystone correction?
Only when you cannot fix the geometry physically. Digital keystone squeezes the image into a smaller set of pixels, which softens fine detail and can cause uneven edges. First center the projector on the screen and level it, then use lens shift if available. The geometry pattern shows the result: parallel edges, square grid cells and round circles.
Which aspect ratio frame should I use?
Use the frame that matches your screen. A 16:9 screen should exactly fit the 16:9 frame from a 1080p or 4K signal. For a 2.35:1 or 2.40:1 cinemascope screen, zoom until the 2.35:1 frame fills the screen width and height and the black bars fall above and below it, or use the projector's lens memory. Older business projectors are often 4:3 or 16:10.
What are the color bars used for?
The 75% bars are a familiar reference for checking that colors are clean and in the right order (white, yellow, cyan, green, magenta, red, blue), that saturation is not exaggerated and that the gray bar looks neutral. Accurate color calibration needs a meter, but bars quickly reveal a wrong color mode, a swapped cable channel or a projector set to the wrong color space.
How do I set brightness and contrast on a projector?
Use the black level pattern in a dark room: raise brightness until the 1% to 2% squares are just visible while the background stays black, then stop. Use the white level pattern for contrast: lower contrast if the 98% and 99% squares merge into the white background. Recheck after changing the lamp mode or picture preset.
What does the convergence test show?
Single-chip DLP projectors have no convergence error. 3LCD, LCoS and 3-chip projectors combine three separate red, green and blue images; if they are slightly misaligned, white lines and dots show colored fringes when you look closely. Many of these projectors offer a panel alignment or convergence menu to shift each color by a pixel or less.
Can I use these patterns without a computer?
Yes. Select the pattern and image size (for example 1920 x 1080 or 3840 x 2160) and press Download PNG. Copy the files to a USB stick or a phone and open them with the projector's or media player's photo viewer. Turn off any zoom or slideshow effects so the image is shown pixel for pixel.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.