HDR Not Detected
Enable HDR in system settings
Gamut
sRGB
Depth
24-bit
Resolution
1920×1080
Scale
1x
HDR10
Static metadata
HDR10+
Dynamic metadata
Dolby Vision
Dynamic+12-bit
HLG
Broadcast compatible
600+ nit · Deep blacks · P3 → Excellent
<400 nit · Washed blacks → Below standard
Professional HDR Detection Tool
Comprehensively evaluate display HDR performance through capability detection, high-brightness/high-contrast test patterns, and gamut coverage verification.
HDR Capability Detection
Automatically detects whether the browser and OS report HDR support, including color depth, gamut, and dynamic range information. Note: browser HDR detection depends on system settings — even if the display supports HDR, it won't be detected unless enabled in the OS.
Brightness Dynamic Range Test
Displays gradients and high-contrast patterns from near-zero to maximum brightness. HDR displays should render deep blacks and bright highlights in the same frame — this is HDR's core value. SDR displays' dynamic range falls far short.
Wide Gamut Verification
HDR10 requires DCI-P3 gamut coverage (25% larger than sRGB). Dolby Vision recommends Rec.2020 coverage. Verify whether your display truly supports the wide gamut required for HDR by displaying P3-exclusive colors.
What Is HDR?
Understanding the revolutionary improvement high dynamic range brings to image quality.
HDR Core Concept
HDR (High Dynamic Range) = high brightness + deep blacks + wide color gamut. In the same frame, the sun can approach 1000 nits while shadows stay below 0.01 nit. Compared to SDR's 0.1-100 nit range, HDR expands the usable brightness range by 10-100x.
HDR Formats
HDR10: open standard, static metadata, 10-bit color depth, PQ EOTF. HDR10+: dynamic metadata (per-scene brightness mapping). Dolby Vision: dynamic metadata + 12-bit internal processing + hardware certification. HLG: broadcast TV HDR standard, backward-compatible with SDR.
"Fake HDR" Problem
Many budget displays label HDR support (accepting HDR10 signals) but have peak brightness under 400 nits and 1000:1 contrast — unable to truly render HDR. VESA DisplayHDR 400 is the minimum certification tier; meaningful HDR experience starts at DisplayHDR 600+.
How to Evaluate HDR Performance
Three dimensions to determine if your HDR is "real HDR."
Check System Settings
Confirm HDR is enabled in the OS: Windows → Settings → System → Display → Use HDR. macOS → System Preferences → Displays (auto-enabled on supported devices). Browser cannot detect HDR capability unless enabled.
Assess Peak Brightness
True HDR experience requires 600+ nit peak brightness. 400 nit is the minimum threshold. In the white test at max brightness — if it doesn't feel "eye-piercingly bright," peak brightness may be insufficient. The difference between SDR and HDR content should be very obvious.
Verify Contrast
HDR blacks should be deep enough. View test patterns in a dark room — if black areas look greyish (IPS without local dimming), HDR effectiveness is severely compromised. OLED or high-zone Mini LED performs best here.
HDR Terminology
PQ (Perceptual Quantizer)
The EOTF used by HDR10, capable of mapping 0.0001-10,000 nit brightness range. Far more precise than traditional gamma — allocates more encoding space to the mid-low brightness range where human eyes are most sensitive. Developed by Dolby, SMPTE ST 2084 standard.
VESA DisplayHDR
Tiered certification for display HDR capability. DisplayHDR 400/500/600/1000/1400/True Black 400/500/600. Numbers represent peak brightness (nits). True Black series requires black brightness <0.0005 nit (for OLED).
Tone Mapping
When HDR content's brightness range exceeds display capability, out-of-range brightness must be "compressed" into the displayable range — this is tone mapping. Good tone mapping preserves highlight detail without losing shadows; poor mapping causes blown-out or washed-out images.
10-bit Color Depth
HDR requires at least 10-bit (1024 grey levels/channel), 4x finer than SDR's 8-bit (256 levels). Prevents banding across the wide brightness range. Some panels use 8-bit+FRC to simulate 10-bit — close but not equal to native 10-bit.
HDR Performance by Panel Type
Panel technology's decisive impact on HDR results.
IPS (No Local Dimming)
HDR Performance:
• Contrast: 1000:1 (severely washed-out blacks).
• HDR effect: virtually no improvement — "fake HDR."
• Not recommended for HDR functionality.
VA Panel
HDR Performance:
• Contrast: 3000-5000:1 (deeper blacks).
• High contrast compensates for brightness — HDR is usable.
• Quantum dot VA + local dimming performs even better.
Mini LED Backlight
HDR Performance:
• Local dimming: 512-2000+ zones.
• Excellent HDR (high brightness + high contrast).
• Note: halo effects at bright-dark boundaries.
OLED / QD-OLED
HDR Performance:
• Contrast: infinite (perfect blacks).
• Best HDR performance — no halo, no light bleed.
• Note: ABL limits sustained fullscreen high brightness.
HDR Optimization Tips
Enable System HDR
Windows: Settings → Display → Use HDR. Ensure HDMI 2.0+/DP 1.4+ connection. USB-C must confirm HBR3 support. Legacy HDMI 1.4 doesn't support 4K HDR signals.
Play HDR Content
Use HDR-capable players: Windows built-in Movies & TV, VLC 4.0+, MPC-BE + MadVR. Netflix/YouTube require Edge/Chrome + HDCP 2.2 + hardware decoding.
Tune Local Dimming
Mini LED displays' local dimming typically has High/Medium/Low levels. High = best contrast but most visible halo. Choose by content — High for movies, Medium for mixed desktop use.
HDR Calibration
HDR calibration is far more complex than SDR — requires PQ-curve-capable software and high-brightness colorimeters. Calman/DisplayCAL 6+ support HDR calibration. Most users are fine with factory presets.
Frequently Asked Questions
Q.My display says it supports HDR — why does it look bad?
Likely "label HDR" (can receive HDR signals) but hardware doesn't qualify. Displays with <500 nit peak brightness and 1000:1 contrast simply cannot render true HDR. Check for VESA DisplayHDR certification and its tier.
Q.Desktop looks grey/discolored after enabling Windows HDR?
This is a known Windows HDR issue. SDR content in HDR mode requires tone mapping, and quality varies between apps. Adjust the "HDR/SDR brightness balance" slider to improve. Windows 11 22H2+ shows significant improvement.
Q.HDR10 or Dolby Vision — which to choose?
Dolby Vision is superior — dynamic metadata optimizes per-scene, 12-bit internal processing is more precise. But requires display hardware DV decoding chip. If neither is available, HDR10 is the universal fallback. Most streaming services offer both formats.
Q.Does 8-bit+FRC count as HDR?
Technically can receive and display HDR10 signals, but FRC may flicker or dither in rapidly changing HDR highlights. Native 10-bit panels provide a better experience. For most people though, the difference is small — brightness and contrast matter more than bit depth.
Q.How to set up HDR gaming?
Enable HDR in Windows → enable HDR mode in-game → adjust paper white brightness and peak brightness per game prompts. Set paper white to 200-250 nit (keeps UI not over-bright); set peak to your display's actual peak brightness.
Q.Should I turn off HDR when watching SDR content?
Depends on your display's SDR-in-HDR tone mapping quality. Windows 11 + high-end displays work well enough to keep it on. If SDR content looks washed out or dark, consider turning HDR off when not watching HDR content.
HDR Testing Tips
- • Cables: HDMI 2.1 or DP 1.4+ is the baseline requirement for 4K HDR. Use included or certified cables — cheap cables may drop the HDR signal.
- • Dark Room: HDR's dynamic range is most apparent in dark rooms. Ambient light significantly diminishes HDR's deep black advantage.
- • Content Is King: Great HDR = great hardware + great content. Watching Netflix 4K HDR or Apple TV+ HDR provides a more intuitive assessment than test patterns.
- • Gaming HDR: Each game's HDR implementation quality varies. Auto HDR (Windows 11) has mediocre results for non-native HDR games.