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R699870 - Helios User Manual
4K AND UHD SETTINGS
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YES” in the Menu > Information Menu and the Gamma “HDR (ST.2084)” should be applied automatically.
If your HDR image seems dull and without depth, this is probably because it doesn’t use the standard PQ Gamma
but uses the Hybrid Log Gamma instead. To obtain a perfect picture, just switch the Gamma curve from HDR
(ST.2084) to HDR (Hybrid Log):
Menu > Picture Adjust > Gamma > HDR (ST.2084) or HDR (Hybrid Log)
ST-2084 Gamma PQ can be used with both BT.2020 and BT.2100 inputs.
Tweaking the Gamma adjustments for 1,000 NITS sources
HDR Gamma default values matches an EOTF for HDR sources up to 1,000 NITS such as UHD Blu-Ray video
discs. The default advanced adjustments are as follow:
Picture Tone: 0
Dark Level: 0
Bright Level: 0
If the picture seems a little dull or too dark
If the picture seems a little dull or too dark, you can change the adjustments as described below:
Picture Tone adjustment: this adjustment changes the overall brightness of the picture. Increase the value to
obtain a brighter picture, recommended with larger screens.
Dark Level: rise this level if the blacks are still too deep
Bright Level: There are several HDR encoding with different maximum brightness. Rise this level if the white
portions of the picture are not totally light up.
7.4  ColorProles
How to identify BT-2020 sources
Nowadays UHD discs and 4K sources can use BT-2020 color encoding, it may eventually be a REC-709 or
DCI-P3 gamut encoded into a BT-2020 prole or a true BT-2020 color prole. Since this unit can only detect the
color prole and not the encoding, some UHD discs may appear show incorrect colors when using the dedicated
BT-2020 color prole. If this is the case, it is better to switch to another color prole and use a standard prole
such as Cinema for DCI-P3 colors or Film for REC-709 colors.
•REC-709 colors:
Menu > Picture Adjust > Color Prole > BT.709
•DCI-P3 colors:
Menu > Picture Adjust > Color Prole > DCI
Setting up the proper BT-2020 Color Profile
Most recent UHD discs use BT-2020 color space, then the user should use this dedicated Color Prole:
•REC-2020 colors:
Menu > Picture Adjust > Color Prole > BT.2020
If the colors seem wrong with BT-2020 Color Prole, you can switch to a any existing Color Prole that
would be more suitable such as Cinema with DCI-P3 colors or Film with REC-709 colors.
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