- Posts: 1
- Joined: Fri Jul 29, 2022 8:23 pm
- Real Name: Dan Nichols
Hi All:
Looking for some clarity on black/white levels on the 12G Video Assist HDR. Here are the details:
Windows 10 Resolve Studio 17.4.6->Thunderbolt
Ultrastudio 4k Mini Desktop Video 12.4->SDI
12G Video Assist HDR Firmware 3.7
Signal Chain:
Toolbox->Generators
10 Step Contrast
BT.2111 Color Bar HLG Narrow
Resolve set for Rec.2020 (Rec.2100 HLG) timeline, HDR 1000 timeline luminance, Rec.2020 (Rec.2100 HLG) output color space. DRTs are both DaVinci, Graphics White Level is 200 nits, White Point Adaptation is enabled, HDR mastering is 1000 nits. HDR10+ Metadata is on.
Under video monitoring, UHD 2160p 29.97 is selected, SDI configuration is set for single link, data levels are video (YCbCr), with sub-black and super-white data retained.
Video bit depth is 10 bit with bilinear monitor scaling and HDR metadata is enalbed over HDMI.
I've confirmed these settings look good in the UltraStudio 4k Mini SDI Output Settings. The only additional info is that the 3G-SDI is set to SMPTE Level A (there is no difference made when it's toggled from Level A to Level B)
The two generated test patterns are missing the lowest gradation of black and all of my video looks like the blacks are being crushed similar to a YCbCr/RGB (limited/full) mismatch. This is not the case.
I've messed with the brightness and contrast on the 12G HDR, my current settings are 50% contrast, 80% brightness and 30% saturation.
I've confirmed that I can see the entire range on an LG C1 that is currently connected to the HDMI output of the UltraStudio.
It seems like the contrast control isn't centered on the 12G Video Assist, either the whites clip out or the blacks clip out.
At 100% contrast the lowest black level is visible, but the white levels above step 6 are clipped. The lowest black level disappears on contrast levels below 64%, but at 64% the top three white levels are clipped.
The highest white level only returns at contrast values of 54% or lower.
All of this differentiation remains across the entire brightness range.
I have no usable settings where I can see the entire range.
What's going on with this device? Is this a workflow issue (as potentially indicated by tech support)?
Thanks in advance for any advice.
Looking for some clarity on black/white levels on the 12G Video Assist HDR. Here are the details:
Windows 10 Resolve Studio 17.4.6->Thunderbolt
Ultrastudio 4k Mini Desktop Video 12.4->SDI
12G Video Assist HDR Firmware 3.7
Signal Chain:
Toolbox->Generators
10 Step Contrast
BT.2111 Color Bar HLG Narrow
Resolve set for Rec.2020 (Rec.2100 HLG) timeline, HDR 1000 timeline luminance, Rec.2020 (Rec.2100 HLG) output color space. DRTs are both DaVinci, Graphics White Level is 200 nits, White Point Adaptation is enabled, HDR mastering is 1000 nits. HDR10+ Metadata is on.
Under video monitoring, UHD 2160p 29.97 is selected, SDI configuration is set for single link, data levels are video (YCbCr), with sub-black and super-white data retained.
Video bit depth is 10 bit with bilinear monitor scaling and HDR metadata is enalbed over HDMI.
I've confirmed these settings look good in the UltraStudio 4k Mini SDI Output Settings. The only additional info is that the 3G-SDI is set to SMPTE Level A (there is no difference made when it's toggled from Level A to Level B)
The two generated test patterns are missing the lowest gradation of black and all of my video looks like the blacks are being crushed similar to a YCbCr/RGB (limited/full) mismatch. This is not the case.
I've messed with the brightness and contrast on the 12G HDR, my current settings are 50% contrast, 80% brightness and 30% saturation.
I've confirmed that I can see the entire range on an LG C1 that is currently connected to the HDMI output of the UltraStudio.
It seems like the contrast control isn't centered on the 12G Video Assist, either the whites clip out or the blacks clip out.
At 100% contrast the lowest black level is visible, but the white levels above step 6 are clipped. The lowest black level disappears on contrast levels below 64%, but at 64% the top three white levels are clipped.
The highest white level only returns at contrast values of 54% or lower.
All of this differentiation remains across the entire brightness range.
I have no usable settings where I can see the entire range.
What's going on with this device? Is this a workflow issue (as potentially indicated by tech support)?
Thanks in advance for any advice.