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DreamVision Siglos Ultra Manual

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4K AND UHD SETTINGS
R699880 - Siglos Ultra Series User Manual 23
8.2  Choosing the correct Input level
Because the Input level of 4K sources are generally “(0-255) Enhanced” input levels, and at the contrary, classic
Blu-Ray discs and HDTV programs use “(16-235) Standard” Input levels. It is important to clearly identify and to
select the correct input level to achieve perfect blacks.
To identify the correct level, you can for example select a dark scene from your movie and switch between
Standard and Enhanced Input levels. The correct Input level would be “Enhanced” if this setting gives the
deepest blacks. If both settings give the same result, then your source uses “Standard” levels.
Generally UHD sources use Enhanced levels: You may try to configure your UHD player to output
Standard levels to be consistent settings with Bluray playback.
Menu > Input Signal > Input level > (0-255) Enhanced
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 Profile “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 identified to be using High Dynamic Range, the projector should display “HDR:
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)
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 Bluray video
discs. 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 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.
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 profile. Since this unit can
only detect the color profile and not the encoding, in some cases, it is better to use a standard color profile such
as Cinema for DCI-P3 colors or Standard for REC-709 colors.
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