Teletext-Tools 768 — Checkerboard Pattern

FULLSCREEN CHECKERBOARD

P768

Use for sharpness, scaling, moiré, and pixel-grid checks.

Exit: press ESC (or tap/click screen).

SETUP

768

OPTIONS

SIZE

STYLE

INVERT

Keys: 1/2/4/8/6 size (16=6) • I invert • ESC exit

STATUS

NOW

READY

If lines “shimmer”: you’re seeing scaling or moiré.

Try: different sizes and sit further back.

Related: 766 gradient • 769 banding • 767 dead pixel.

Quick jump: 767 Dead Pixel Test • 769 Banding Test

HOW TO USE

1) Press START

2) Optional: FULLSCREEN

3) Switch SIZE to reveal scaling artifacts

4) Use INVERT to change which pixels are lit

5) Exit: ESC or tap/click screen

WHAT IT TESTS

Sharpness: does 1px look crisp or blurred?

Scaling: shimmer = interpolation / resizing

Moiré: interference patterns on fine grids

Uniformity: look for tinted patches on grey mode

BEST RESULTS

Use native resolution (no browser zoom).

Disable “smooth scaling” settings if available.

Try both portrait and landscape orientations.

FAQ

Why does 1px look like grey? subpixel layout + scaling.

Why does it “crawl”? your display is resampling the pattern.

Is this bad? not necessarily — TVs often scale everything.

How do I reduce it? use native res, disable motion processing.

TV / MONITOR NOTES

TVs: set “PC mode” or “Game mode” for cleaner pixels.

Monitors: check sharpness setting isn’t oversharpening.

Phones: try different brightness levels.

SAFETY

No flashing here — but avoid staring close-up for long.

OLED: don’t leave high-contrast patterns on for hours.

MINI BLOG

A checkerboard is a “worst case” signal for scaling. If your device resizes the image, the tiny squares can blur or shimmer.

Try 2PX and 4PX to see where the picture becomes stable.

Grey mode is useful for spotting subtle tinting and panel uniformity issues.

RELATED PAGES

766 Gradient Test • 769 Banding Test

767 Dead Pixel Test • 761 Black • 762 White

KEYWORDS

checkerboard pattern test • moiré test • sharpness test

display scaling test • pixel grid checker