VISUAL INSPECTIONsharpness-geometry
2 min
Desktop Recommended
Client-Side Local
Checkerboard Pattern Test
High-frequency checkerboard patterns rendered from 1x1 up to 16x16 pixel blocks. Essential for diagnosing video scaler interpolation, chroma subsampling artifacts (4:2:0 vs 4:4:4), and display sharpness.
Technical Scope & Limitations
Evaluates digital pixel sharpness. Ensure browser zoom is at 100% for 1x1 patterns to render accurately.
Browser rendering output can be influenced by OS display scaling, GPU driver color settings, and active HDR profiles.
Testing Instructions
- Cycle through checkerboard sizes (1x1, 2x2, 4x4, 8x8, 16x16).
- On 1x1 checkerboard, the pattern should produce a uniform neutral gray without shimmering or moiré.
- Larger sizes (4x4 to 16x16) should exhibit razor-sharp square corners.
Interaction Controls
Next Pattern
→Space
Previous Pattern←
Exit FullscreenEsc
Mouse / TouchTap screen to cycle
Pattern 1 of 5: 1x1 Checkerboard
Checkerboard Block Size
What This Test Checks
- Spatial frequency limits: 1x1, 2x2, 4x4, 8x8, and 16x16 block rendering.
- Chroma subsampling and pixel phase alignment.
- Edge contrast and pixel corner definition.
How to Perform the Test
- Enter fullscreen mode.
- Cycle through 1x1 up to 16x16 checkerboard sizes.
- Observe 1x1 from a short distance: it should blend into an even 50% gray.
What to Look For
- On 1x1 checkerboard, look for flickering or uneven blotches.
- Larger blocks should exhibit razor-sharp 90-degree corners with zero blurring.
Common Display Problems & Diagnostic Guidance
1x1 Moiré Wave Interference
If the browser zoom is 110% or 125%, 1x1 checkerboard patterns will create dramatic curving moiré waves. Return zoom to 100% (Ctrl+0) for accurate testing.
Frequently Asked Questions
Why does a 1x1 checkerboard look gray from far away?
Because human eye spatial visual acuity blurs microscopic black and white alternating pixels together, averaging them into a perceived 50% neutral gray.