V-Ray Tip: Monitor Calibration and V-Ray Color Management

Calibrating your display is the quickest way to ensure V-Ray renders look consistent across workstations, devices, and delivery platforms.

• Pick the right targets (SDR)
  • White point: D65 (6500K)
  • Gamma/EOTF: 2.2 for sRGB (general), 2.4 for Rec.709 in dim rooms
  • Luminance: 100–160 cd/m² for general look‑dev, 80–120 cd/m² for print‑oriented work
  • Gamut: sRGB/Rec.709 unless your pipeline explicitly delivers P3/Rec.2020
• Use proper tools
  • Hardware colorimeter (e.g., Calibrite/X‑Rite or Datacolor) over visual “by eye” methods
  • Prefer displays with hardware LUT calibration (BenQ SW/PD, EIZO CG/CS, NEC SpectraView) for stability
  • Create ICC v2 profiles for wide app compatibility; save per‑display, per‑room lighting condition
• Preparation before calibration
  • Warm up the monitor for 30 minutes; set native resolution and 100% scaling
  • Disable Dynamic Contrast, Local Dimming, “Vivid”/“Game” modes, and any vendor “enhancements”
  • Control ambient light (neutral wall colors, consistent dim lighting)
• Calibration workflow
  • Select sRGB/Custom mode on the display; set target luminance and contrast
  • Run the calibrator, generate the ICC, and set it as the OS default for that monitor
  • Validate with 100+ patch set; aim for average ΔE ≤ 2 (≤ 1 is excellent)
• Integrate with V-Ray color management
  • For a straightforward SDR pipeline: render in linear sRGB and enable sRGB display correction in the V-Ray Frame Buffer (VFB)
  • For ACES/OCIO pipelines: load the ACES config.ocio in VFB, set Rendering Space to ACEScg, and choose the appropriate View (e.g., sRGB or Rec.709)
  • Avoid double transforms: use either the VFB sRGB button or an OCIO View—never both simultaneously
  • Match the VFB View to your delivery color space; your OS monitor ICC handles device characterization
• Texture and export hygiene
  • Tag texture inputs correctly (sRGB for albedo; linear for data maps such as roughness/normal)
  • Export 16/32‑bit EXR in scene‑linear (sRGB or ACEScg) and apply the same OCIO/ICC in compositing
• Multi-monitor and HDR notes
  • Calibrate each display; align luminance and white point to minimize cross‑screen shifts
  • Leave OS HDR off for SDR look‑dev unless your pipeline requires HDR (PQ/HLG) and you have a true HDR reference

Quick checklist:
• Calibrate monthly or after major GPU/OS updates
• Validate ΔE regularly and watch grayscale neutrality
• Keep one display as your “reference” for approvals

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