The HDMI Fourm in control of standardising HDMI options. At CES 2022, HDMI Discussion board will launch HDMI 2.1a a brand new commonplace which is able to supply a brand new function – Supply-Primarily based Tone Mapping (SBTM)
The HDMI Discussion board, in control of standardising HDMI requirements, will showcase HDMI 2.1a at CES 2022. The brand new commonplace brings Supply-Primarily based Tone Mapping (SBTM). Based on The Verge, “SBTM is a brand new HDR function that offloads among the HDR tone mapping to the content material supply (like your laptop or set-top field) alongside the tone mapping that your TV or monitor is doing.”
What’s HDMI 2.1a and Supply-Primarily based Tone Mapping (SBTM)
HDMI 2.1a is the brand new commonplace introduced by the HDMI Discussion board. The distinctive factor about this new HDMI commonplace is the Supply-based Tone Mapping. Supply-Primarily based Tone Mapping or SBTM, briefly, offloads the HDR tone mapping from the TV to the participant or quite the supply of the HDR content material. For instance, when you’ve got a Blu-ray participant or a laptop computer linked to the TV, and you might be consuming HDR content material, the tone mapping might be dealt with by the participant as a substitute of the TV.
This means of the participant to deal with the tone mapping instead of the TV is not one thing new and we’ve got seen it in motion with Dolby Imaginative and prescient content material. You possibly can try the video beneath to get an understanding of the distinction between TV led Dolby Imaginative and prescient and the player-led (or quite source-based) Dolby Imaginative and prescient.
From the video above it’s clear that the TV led Dolby Imaginative and prescient had a extra correct output in relation to colors, brightness and total punchiness of the colors for the content material being consumed. The identical is the case for Dolby Imaginative and prescient IQ content material. As per the video, the sunshine sensor is on the TV to find out the quantity of ambient mild within the room, which is what Dolby Imaginative and prescient IQ depends on. Therefore, Dolby Imaginative and prescient IQ content material will seem inaccurate with the player-led Dolby Imaginative and prescient implementation as there is no such thing as a method for the TV to inform the participant the information is gathering by way of the sunshine sensor to map the colors and brightness.
What stays to be seen is that if these points are addressed indirectly with the HDMI 2.1a commonplace. Based on the Verge, SBTM is “supposed to assist current HDR setups work higher by letting the content material supply higher optimize the content material it passes to the show or by eradicating the necessity to have the person manually calibrate their screens for HDR by having the supply machine configure content material for the particular show. Different use instances might be for when there’s a mixture of content material varieties, like for streamers (who might have an HDR sport taking part in alongside a window of black and white textual content), displaying every space of content material.”
This can be fascinating to see as calibrating a TV for HDR does contain tinkering with the backlighting, distinction, sharpness, tone mapping, color temperature, and so forth. to get one of the best output. Some TVs just like the Sony A80J (overview) and even the LG G1 (review)/ C1 (overview) supply some unbelievable out of the field image presets to get one of the best HDR expertise.
Talking of auto-calibration, Sony has issued an replace that routinely calibrates the brightness setting of the PS5 (overview) eliminating the necessity for the person to manually calibrate the height brightness and black stage when the console is linked to the TV for the primary time. You possibly can try this setting in motion in our video overview of the Sony A80J beneath.
As for HDMI 2.1a, it’s one more addition to the confusion the HDMI Discussion board is making to the HDMI Commonplace. Going ahead, a TV can name itself HDMI 2.1 enabled with out providing options like 4K 120Hz, VRR, ALLM and extra. It is because HDMI 2.0 and 1.4 are actually a subset of the HDMI 2.1 commonplace. You possibly can perceive extra in regards to the present state of HDMI 2.1 right here.