
Io XT/4K Capture, Display, Convert v14.0 54 www.aja.com
Io 4K HDMI HDR Screen in 4K Mode
Figure 22. HDMI HDR Screen with 4K Primary Format
The HDMI-HDR screen, only available in 4K Mode, provides a mechanism to
inform an HDMI sink device (such as a TV or monitor) that the video content is
HDR. This includes generation of the Dynamic Range and Mastering Infoframe
and the static metadata descriptors as defined in CTA-861.3 and HDMI v2.0a.
Included are pre-canned primaries values for BT.2020 and DCI P3 color gamuts.
HDR Mode
• Off - HDR Mode disabled (default).
• DCI-P3 D65 - Only Display Mastering Luminance available for Digital
Primaries.
• BT.2020 - Typically used with HDR.
• Custom - Allows custom values for the Digital Primaries.
EOTF
The Electrical Optical Transfer Function metadata bit tells the HDMI display which
EOTF to use. Most TV’s will require this to be set to ST 2084 for their HDR modes.
• Trad Gamma SD
• Trad Gamma HD
• ST 2084 (HDR-10)
• HLG (Hybrid Log Gamma) - No meta-data for Digital Primaries.
Ext. Color
Most TV’s require this be set to Non-Const Luma to go into their HDR modes.