VISUAL INSPECTIONhdr
2 min
Client-Side Local
HDR Black Level Test
In HDR mode, displays must maintain deep shadow detail while handling high overall dynamic range. Evaluates near-black patches with and without surrounding bright reference markers.
Technical Scope & Limitations
Visual inspection. Contrast perception varies with room lighting and display panel technology.
Browser rendering output can be influenced by OS display scaling, GPU driver color settings, and active HDR profiles.
Testing Instructions
- Inspect the near-black test steps on a pitch-black backdrop.
- Toggle Mixed Contrast mode to see if surrounding bright elements wash out shadow details.
- Verify that black remains pitch black without elevated gray haze.
Interaction Controls
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Mouse / TouchTap screen to cycle
Dark Room Mode Recommended
Pattern 1 of 1: Near-Black Patches (RGB 0–32)
What This Test Checks
- Near-black threshold stability when operating in an HDR color pipeline.
- Prevention of elevated gray haze in letterbox bars or deep shadows.
- Shadow detail visibility alongside bright on-screen elements (mixed contrast).
How to Perform the Test
- Dim ambient room lights to maximize visual contrast perception.
- Enter fullscreen mode and cycle through the near-black test blocks.
- Ensure the surrounding black background remains pitch black without glowing.
What to Look For
- If the entire screen looks washed out with a gray fog when HDR is enabled, the HDR tone-mapping curve or black level is elevated.
Common Display Problems & Diagnostic Guidance
Washed-Out Blacks in HDR
Some monitors raise their backlight to maximum in HDR mode, turning 1000:1 IPS contrast into murky dark gray instead of deep black.
Frequently Asked Questions
Can LCD screens produce true HDR blacks?
Standard edge-lit LCD screens struggle with true HDR blacks because backlight light bleeds through the liquid crystals. Full-Array Local Dimming (Mini-LED) or self-emissive OLED screens are required for deep HDR contrast.