1:1 Pixel Mapping Test
Renders unscaled 1-pixel checkerboard and line patterns at native device coordinates. If the monitor internal scaler, OS scaling, or browser zoom is not 100% 1:1, moiré and uneven gray smearing will appear immediately.
Technical Scope & Limitations
OS scaling, browser zoom levels, and GPU resolution scaling heavily impact results. This test evaluates the full software-to-display pipeline, not just the monitor scaler alone.
Browser rendering output can be influenced by OS display scaling, GPU driver color settings, and active HDR profiles.
- Ensure your browser zoom is set to exactly 100% (Ctrl+0 or Cmd+0).
- Enter fullscreen mode.
- Observe the 1px checkerboard: across a native 1:1 mapped screen, it appears as an even, flicker-free neutral gray.
- If you see wave patterns, moiré ripples, or dark bands, your screen is being scaled or interpolated.
Ensure your browser zoom is exactly 100% (Press Ctrl+0 or Cmd+0). Current detected Device Pixel Ratio (DPR): 1.00.
What This Test Checks
- Native 1:1 pixel rendering accuracy.
- Non-native display scaling, interpolation, and blurry text.
- Browser zoom offset distortions.
- GPU display scaling artifacts.
How to Perform the Test
- Set browser zoom to 100% (Ctrl+0 / Cmd+0).
- Enter fullscreen mode.
- Observe the 1px checkerboard: it should render as a flat, uniform, calm gray.
- Inspect 1px vertical and horizontal lines for consistent single-pixel width.
What to Look For
- Moiré patterns, rainbow fringes, or uneven stripes indicate image interpolation.
- A true 1:1 mapped display shows a uniform, flicker-free pattern.
Common Display Problems & Diagnostic Guidance
Windows Display Scaling (125% / 150%)
On 1440p or 4K monitors, Windows default fractional scaling can cause non-integer pixel boundaries. High-DPI applications handle this via subpixel rendering, but exact 1px test grids will show scaling artifacts unless integer scaling (100% or 200%) is selected.
Frequently Asked Questions
What is 1:1 pixel mapping?
1:1 pixel mapping means that each digital pixel generated by your graphics card corresponds to exactly one physical pixel on your monitor, with zero scaling or interpolation.