HDR Communication & Documentation 2 — Questions and Answers
Question 1: When documenting an HDR project for a client handoff, which metadata standard is most commonly used to embed display mastering information?
- EXIF 2.3
- SMPTE ST 2086 (Correct answer)
- XMP Dublin Core
- ICC v4 profile
Correct answer: SMPTE ST 2086
SMPTE ST 2086 defines the mastering display color volume metadata (MaxCLL, MaxFALL, primaries) used in HDR handoffs.
Question 2: A colorist sends a QC report noting 'clipping above 1000 nits on highlight elements.' Which corrective action should be communicated back first?
- Re-render with a lower MaxCLL value
- Apply a roll-off or highlight compression to affected shots (Correct answer)
- Switch the deliverable to SDR only
- Flag the report as non-critical
Correct answer: Apply a roll-off or highlight compression to affected shots
Highlight clipping requires applying a roll-off or compression to bring peak values within the mastered ceiling before re-QC.
Question 3: In an HDR delivery specification document, MaxFALL stands for:
- Maximum Frame Average Light Level (Correct answer)
- Maximum Full-Aperture Luminance Limit
- Minimum Frame Adjusted Luma Limit
- Maximum Fixed Aperture Luma Level
Correct answer: Maximum Frame Average Light Level
MaxFALL (Maximum Frame Average Light Level) is the average of all pixels across all frames, expressed in cd/m².
Question 4: Which document type is typically used to communicate agreed-upon HDR tone mapping decisions between a studio and a streaming platform?
- Color Decision List (CDL)
- Technical Specification Agreement (TSA) (Correct answer)
- Look-Up Table manifest
- Operational readiness plan
Correct answer: Technical Specification Agreement (TSA)
A Technical Specification Agreement captures mutually approved parameters like target peak nits, tone mapping approach, and metadata values.
Question 5: A delivery note specifies 'PQ 1000-nit master, with a 600-nit HLG trim pass.' What does the trim pass communicate?
- The HLG version was graded independently at full broadcast range
- A secondary grade was created to optimize the content for lower-peak HLG displays (Correct answer)
- The HLG file uses a different color gamut than the PQ master
- The HDR10 metadata was removed from the HLG file
Correct answer: A secondary grade was created to optimize the content for lower-peak HLG displays
A trim pass is a secondary color grade that optimizes the appearance of HDR content for a different display target, here 600-nit HLG broadcast.
Question 6: When writing a shot-level VFX brief for HDR content, why must reference frame luminance values be specified?
- To set the bit depth for compositing
- So VFX artists can match the correct linear scene-referred values when integrating elements (Correct answer)
- To determine the audio loudness standard
- To define the codec used for dailies
Correct answer: So VFX artists can match the correct linear scene-referred values when integrating elements
Specifying luminance values ensures VFX elements are composited at the correct scene-linear light levels to match the HDR grade.
Question 7: Which communication practice best prevents misalignment when collaborating remotely on HDR grades across facilities?
- Sharing still frames as JPEG screenshots
- Exchanging calibrated reference stills in 16-bit TIFF with embedded ICC profile and metadata (Correct answer)
- Describing grades verbally in meeting notes
- Sending H.264 proxies with burned-in timecode only
Correct answer: Exchanging calibrated reference stills in 16-bit TIFF with embedded ICC profile and metadata
16-bit TIFFs with embedded ICC profiles preserve the full HDR range and color space information needed for accurate remote review.
HDR Communication & Documentation 2
When documenting an HDR project for a client handoff, which metadata standard is most commonly used to embed display mastering information?