Gray Screen — Calibration Grays

    18%, 50%, and neutral gray presets for monitor testing and video calibration

    True middle gray for gamma & uniformity

    #808080

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    📖 Read the complete guide for in-depth tips and troubleshooting.

    What Is a Gray Screen Test?

    A gray screen displays neutral mid-gray for monitor calibration and uniformity checks. Gray reveals color tint, banding, and vignetting that pure white or black can hide. Choose 18%, 50%, or neutral gray presets and run fullscreen at native resolution.

    How to Test Your Monitor With Gray

    1. Select the gray preset that matches your test goal
    2. Enter fullscreen at native resolution
    3. Dim room lights to avoid reflections
    4. Scan from center to edges for tint and clouds
    5. Compare with White and Black Screen tests

    Gray Screen Testing Uses

    Tint detection

    Green or pink cast on neutral gray

    Uniformity

    Cloudy patches on solid fields

    Banding check

    Steps visible on smooth ramps

    Calibration reference

    Mid-gray for gamma workflows

    Video grading

    Neutral reference on set monitors

    Warranty photos

    Document panel defects clearly

    Related Tools

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    Frequently Asked Questions

    What is 18% gray used for?

    18% gray (#2E2E2E) is a standard reference in photography and video for exposure and white balance. It represents a dark mid-gray that cameras meter as "middle gray" and is used to check monitor gamma and tint.

    What is 50% gray?

    50% gray (#808080) is true middle gray — equal red, green, and blue values. It is ideal for checking brightness uniformity, gamma response, and whether your display crushes shadows or blows highlights.

    When should I use neutral gray?

    Neutral gray (#777777) is slightly darker than 50% gray and helps spot color casts. If the screen looks green, magenta, or yellow instead of neutral, your monitor may need calibration.

    How do I use the gray screen for calibration?

    Enter fullscreen in a dim room and compare the gray to a printed gray card or reference image. Look for uneven brightness (clouding), color tint, or banding across the screen.

    Is this gray screen tool free?

    Yes. All gray presets are free to use online in your browser with no download or registration required.