Subpixel Layout Detector

Identify RGB vs BGR subpixel arrangement

What is Subpixel Layout?

LCD displays use red, green, and blue subpixels arranged in a specific order. Most displays use RGB (Red-Green-Blue) order from left to right, but some use BGR (Blue-Green-Red). Knowing your layout helps configure font rendering (ClearType on Windows, font anti-aliasing on Mac/Linux) for sharper text.

Why Does It Matter?

Operating systems use subpixel rendering to make text appear sharper by taking advantage of the subpixel structure. If the OS assumes RGB but your display is BGR (or vice versa), text may appear slightly blurry or have colored fringes.

How to Test

1. Look closely at the test patterns below (you may need to get very close to your screen)
2. The pattern that appears sharpest and most neutral (no colored edges) indicates your subpixel layout
3. If patterns look the same, your display likely uses RGB (the most common arrangement)

Test Patterns

Zoom Level (get close to see subpixels)

RGB Pattern

If this looks sharper, your display uses RGB subpixel layout

BGR Pattern

If this looks sharper, your display uses BGR subpixel layout

Common Subpixel Layouts

RGB (Red-Green-Blue)

Most common. Standard for most LCD monitors, laptops, and external displays.

BGR (Blue-Green-Red)

Less common. Found in some older displays and certain monitor models.

PenTile (RGBG)

Used in many OLED displays (phones, tablets). Alternating RG-BG pattern.

Vertical Stripe

Uncommon. Subpixels arranged vertically instead of horizontally.

Configuring Your System

Windows ClearType

Search for "ClearType" in Windows settings. The tuner wizard will automatically detect your subpixel layout.

macOS

macOS automatically detects subpixel layout. No manual configuration needed.

Linux

Configure font rendering in your desktop environment settings. Set RGB or BGR order manually.

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