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The Quick Brown Fox Jumps Over The Lazy Dog. 1234567890.

The Quick Brown Fox Jumps Over The Lazy Dog. 1234567890.

Chroma Subsampling

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Chroma Subsampling Guide

Test Information

The Chroma Subsampling test verifies that your computer and display are communicating with full color resolution. This is critical for reading text, coding, and seeing fine UI details without distracting “color fringing.”

🧪 How to Use the Patterns

This test uses high-contrast color-on-color text to stress the display interface: 🟦🟥 Cyan/Red Block: Displays Red text on a Cyan background.

🟪🟦 Magenta/Blue Block: Displays Blue text on a Magenta background.

🔳 Pattern Grid: Includes 1-pixel alternating lines of primary colors.

🔍 What to Look For

🔎 Text Clarity: Look closely at the “Quick Brown Fox” text. Is it perfectly sharp?

  1. ✅ Pass: The text is as sharp as white-on-black text. You have a 4:4:4 or RGB Full signal.
  2. ❌ Fail: The letters look blurry, smeared, or have strange “halos” or missing vertical segments. This indicates 4:2:2 or 4:2:0 compression. 📶 Pattern Resolution: Look at the dithered rows at the bottom. If they look like a solid, blurry brown color instead of sharp, alternating lines, your signal bandwidth is being compressed.

🧠 Expert Interpretation & Fixes

If you “fail” this test, your display is discarding 50% to 75% of the color information to save bandwidth.

  1. 🖥️ Nvidia/AMD Settings: Go to your GPU control panel and ensure “Output Color Format” is set to RGB (Full) or YCbCr 4:4:4.
  2. 📺 TV Mode: If using a TV, ensure the input icon is set to “PC” and that “HDMI Ultra HD Deep Color” or “Game Mode” is enabled.
  3. 🔗 Cable Check: 4K at high refresh rates requires a high-bandwidth HDMI 2.1 or DisplayPort 1.4+ cable. If your cable is old, it might be forcing the system into a compressed mode.

Free online 4:4:4 chroma test. Troubleshoot blurry text on TVs-as-monitors and optimize HDMI signal quality for professional work.