Projector Gamma Calibration Test

This tool checks how your projector maps signal level to brightness — its gamma, or transfer curve. A field of one-pixel black-and-white stripes optically averages to exactly 50% light output, so it sits next to a solid grey computed for a target gamma. When the two halves merge, your projector is tracking that curve; when the stripes look lighter or darker than the patch, the curve is wrong and mid-tones are being lifted or crushed. Four references are provided: 1.8 (legacy Mac), 2.2 (sRGB and general viewing), 2.4 (Rec.709 in a dim room) and BT.1886, the HDTV reference that bends toward your panel's real black floor.

How to verify gamma

Start at γ 2.2

The default for most rooms and streaming content. Project it full-screen and let your eyes settle for a moment.

Step back and squint

From a few metres the stripes should dissolve into a flat grey that is impossible to tell apart from the solid half.

Read the mismatch

Stripes look lighter? Gamma is too low — drop the projector's gamma or brightness. Darker? Gamma is too high — raise it.

Confirm at 2.4 / BT.1886

In a fully darkened room re-check against 2.4 or BT.1886, which most calibrators prefer for cinema viewing.

Read your projector's tone curve from the 50% blend point

Squint slightly. The alternating-stripes half blurs to a perceptual mid-grey. If your projector's gamma matches, that grey blends with the solid reference. If the stripes look brighter — gamma is too low. Darker — too high.

Features

1px-stripe blend gauge

A dithered 50%-grey field beside a solid reference patch — the most sensitive way the eye can judge a single point on the gamma curve.

Four target curves

Switch between γ 1.8, 2.2, 2.4 and BT.1886 to match whichever preset your projector exposes in its menu.

Shadow and highlight read-out

Stripes brighter than the patch means lifted, washed-out shadows; darker means crushed blacks and lost detail in dark scenes.

Distraction-free surround

The pattern fills the screen on a plain background so stray menus or wallpaper do not throw off your eye's brightness reference.

Why this gamma test

Most gamma patterns ask you to count steps on a grey ramp, which is hard to judge and depends on the very curve you are checking. The one-pixel stripe field sidesteps that: it is a true, gamma-independent 50% reference your eye can lock onto in seconds. Four standard curves cover every projector preset from legacy 1.8 to the BT.1886 cinema reference, and the brighter/darker read-out tells you which direction to nudge the setting. Runs full-screen in any browser with no install, so you can drive it from a phone mirrored to the projector while you adjust from across the room.

FAQ

What gamma should I use?

Use 2.2 for mixed rooms and daytime viewing, and 2.4 (or BT.1886) for a dark, dedicated cinema room. The darker the room, the higher the gamma you can comfortably run before shadows look washed out.

What is BT.1886?

BT.1886 is the HDTV reference tone curve. It behaves like 2.4 in the highlights but bends gracefully into your display's actual black level near the bottom, so shadow detail stays visible instead of being clipped to flat black.

Why do stripes work better than a grey ramp?

A printed or coded grey depends on the very gamma you are trying to measure, so it is circular. One-pixel stripes are pure black and white at full and zero level — their optical average is fixed at 50% regardless of gamma, giving you an honest reference point.

My blend point is fine but dark scenes still look murky

Gamma sets mid-tone slope, not the black floor. If shadows are murky, also check black level (brightness) and ambient light. A 2.4/BT.1886 curve plus a darker room usually restores shadow punch.

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Who is this tool for?

📽️ Projector Owners

Published 01 May 2026 Updated 02 May 2026 Authors: The Supreme