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4K AND UHD SETTINGS
R699890 - Siglos X-tra Series User Manual 23
8.3  High Dynamic Range sources
Identifying HDR sources.
HDR sources are almost exclusively from the latest UHD discs or TV/internet streaming video that come with a
HDR logo. If your player supports this format, this unit should automatically detect the HDR format thanks to the
HDMI 2.0 handshake and the projector should apply automatically the correct Color Prole “HDR”. Make sur that
the correct Gamma is selected depending on your source: Hybrid Log, ST.2084 or Standard.
Applying the correct Gamma settings
If the source is clearly identied to be using High Dynamic Range, the projector should display “HDR:
YES” in the Menu > Information Menu and the Picture Mode “HDR” should be applied automatically.
If your HDR image seems dull and without depth, check in the Menu > Information and check if the Colorimetry
is BT.2020, if this is the case, you can switch the Color Prole from HDR to BT.2020.
Menu > Picture Adjust > Color Prole > HDR or BT.2020
If the picture is still dull and comes from a TV Broadcast or internet web source, you should probably switch the
Gamma to Hybrid Log Gamma instead of HDR (ST.2084):
Menu > Picture Adjust > Gamma > HDR (ST.2084) or HDR (Hybrid Log)
Gamma tweaking for 1000 nits MaxCLL
When explicitly present in source container, the Information menu displays the levels in nits of the brightest pixel
of the stream (MaxCLL) level and also the brightest frame level, MaxFALL.
This projector is congured with an HDR Gamma that matches an EOTF for HDR sources with a MaxCLL of 1000
NITS as recommended in UHD Bluray standards. The default advanced adjustments are as follow:
Picture Tone: 0
Dark Level: 0
Bright Level: 0
If the HDR picture seems a little dull or too dark
If the MaxCLL/MaxFALL values do not correspond, the picture will look 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 for larger screens or if the actual MaxCLL is lower than 1000 nits.
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.
8.4  ColorProles
How to identify BT-2020 sources
UHD discs and 4K sources can use BT-2020 colors, that means that the movie can use REC-709 or DCI-P3
colors encapsulated into the BT.2020 color space or use a true native BT-2020 color prole. Since this unit can
only detect the color prole and not the encoding, in some cases, it is better to use a standard color prole such
as Cinema for DCI-P3 colors or Standard for REC-709 colors.
•Standard HDTV (REC-709) colors:
Menu > Picture Adjust > Color Prole > Standard
•Movies encoded with richer colors:
Menu > Picture Adjust > Color Prole > Cinema 1 or Cinema 2
•REC-2020 colors:
Menu > Picture Adjust > Color Prole > BT.2020
23


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