Contrast Test — Check Monitor Black Levels & Contrast Ratio

NEW TO THIS? HERE’S THE PLAIN-ENGLISH VERSION.

What this test is

A set of black and near-black screens that show how deep and dark your monitor’s blacks really are.

How it helps you

Good contrast is what makes movies and games look rich instead of washed-out grey — this tells you where your screen actually stands.

What we’re checking

How close your “black” is to true black, and whether you can still make out detail in very dark shades.

TEST_AREA.PREVIEWCheckerboard Pattern · 1/4

Checkerboard Pattern - Edges should be sharp and clear

Look for sharp edges between the black and white squares. The pattern should be uniform without any moiré or distortion.

F11 or Full Screen · ← → patterns · Esc exit

How to Run the Test

Dim the room significantly. Ambient light reflecting off the panel washes out black levels and distorts your perception of the display’s actual contrast — the number-one reason people misjudge their monitor.

1Go fullscreen and dim the room. Press Full Screen and turn the lights down — contrast is only judgeable in a controlled, dim environment.
2Observe the black level. On the pure-black pattern, note how truly black it looks. LCD shows dark grey; OLED goes fully off.
3Check near-black separation. On the near-black steps, confirm you can still distinguish very dark shades from pure black — that is preserved shadow detail.
4Run the checkerboard. Alternating black and white squares reveal ANSI contrast — a better measure of real-world contrast than static figures.

What Contrast Ratio Means

Contrast ratio is the brightest white divided by the darkest black — a 1000:1 ratio means white is 1,000× brighter than black. The higher the ratio, the deeper the blacks and the more three-dimensional dark content looks. Here is roughly what each tier delivers in a dark room:

1000:1

Grey-ish blacks

4000:1

Deep, satisfying black

∞ (OLED)

Absolute black

Contrast Ratio by Panel Type

Panel type	Typical contrast	Notes
TN	~1000:1	Adequate; limited black depth
Standard IPS	1000–1500:1	Accurate colour; limited contrast
VA	2500–6000:1	Best LCD contrast; great dark scenes
Mini-LED IPS	Up to 1,000,000:1	Local dimming zones; some halo
OLED	~1,000,000:1 (effective)	Pixels switch off; true black

VA has by far the best contrast of any LCD — the preferred choice for dark rooms, movies, and atmospheric games — but its dark-transition response time is slower, so it can trade some motion clarity for those deep blacks. OLED’s contrast is effectively infinite; mini-LED gets close via local dimming but can bloom around bright objects on dark backgrounds.

What Contrast Affects

Dark-scene gaming & video

Contrast decides how dark scenes look. A 1000:1 IPS in a dark room shows grey blacks; a 4000:1 VA or OLED shows genuine shadow. Most visible in horror, space, and night scenes.

HDR performance

True HDR needs bright highlights and deep shadows at once — high contrast is a prerequisite. HDR400 panels at 1000:1 cannot produce convincing HDR.

General productivity

For bright-room office work contrast matters less — ambient light lifts apparent black regardless. The difference between 1000:1 and 4000:1 mostly appears in dim environments.

How to Get the Most Contrast From Your Panel

Dim the room. Ambient light is the biggest enemy of perceived contrast — nothing else comes close.
Set gamma to 2.2. The correct curve preserves shadow detail; verify it with the gamma test.
Turn HDR off for SDR content. HDR mode on LCD often clips near-black tones, crushing shadow detail.
Don’t max the OSD contrast slider. Pushed too high it blows out highlight detail into a single bright block.
Rule out backlight bleed. Bright edge patches lift your black level — check the backlight bleed test.

// FAQ

Contrast FAQ

What is contrast ratio on a monitor?+

Contrast ratio is the ratio between the brightest white and the darkest black a display can produce. A 1000:1 ratio means white is 1,000 times brighter than the deepest black the panel can show. Higher contrast means darker blacks, better shadow detail, and more visual depth in dark content.

What is a good contrast ratio?+

For general use, 1000:1 (standard IPS) is adequate. For dark-room use, movies, and gaming, 2500:1 or higher (VA) is noticeably better. For professional HDR or dark-critical work, OLED or mini-LED with local dimming. There is a clear qualitative difference between 1000:1 and 3000:1+ in a dimmed room.

Why does OLED have better contrast than LCD?+

LCD panels use a backlight that lights the whole panel — even “black” areas stay lit from behind, producing dark grey rather than true black. OLED pixels emit their own light and can switch off completely, producing absolute black. That gives OLED a contrast advantage no LCD can match without local dimming.

How do I improve contrast on my monitor?+

Reduce ambient light in the room — the single most effective change. Set gamma to 2.2 and turn HDR mode off for SDR content (HDR mode often crushes near-black tones on LCD). Do not raise the OSD “contrast” slider too high, which clips highlight detail. For the best inherent contrast on your next purchase, choose VA or OLED.

What is ANSI contrast and why does it matter?+

ANSI contrast measures black and white simultaneously using a checkerboard, rather than a full-black then full-white sequence. It reflects real-world contrast far better because on-screen scenes mix bright and dark areas at once. The checkerboard pattern in this test shows ANSI-style contrast; it is usually lower than the marketed static figure.

Does higher contrast mean a better monitor?+

For dark-room viewing, movies, and atmospheric games, yes — contrast is the single most impactful factor for perceived image depth. For bright-office productivity it matters less, since ambient light lifts the apparent black level regardless of the panel. Balance contrast against your actual environment and use.

Why do my blacks look grey?+

On any LCD, “black” is backlight leaking through a closed liquid-crystal cell, so it reads as dark grey — most visible in a dark room. Excess brightness, HDR mode on SDR content, or ambient light reflecting off the panel all make it worse. If you also see bright patches at the edges, that is backlight bleed — check the backlight bleed test.