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Neil Robinson (LG) is responsible for the calibration capabilities. He has this user name:


If you can open a separate thread talking specifically about the problem, maybe other users can comment, and it may bring some attention.
Ok, thanks Ted, I'll do this, tomorrow I get organized and open a specific tread.
 

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Hi,

I have seen that bug, and it looks like a TV UI bug.

Try to change the picture mode, adjust a setting randomly to that different picture mode, and then re-select the initial picture mode.
Hmm i did try your suggestion, it doesn't seem to be a UI bug, color gamut switching sometimes doesn't work at all, i still need to cut the power to the TV to fix it.
 

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Discussion Starter #1,643
Are there any Resolve users here? I'm a little confused whether Resolve can be used as a proper pattern generator to output 255.255.255. What I understood from Ted is that when you generate a patch with a patch scale of 0-255 in Colourspace, it will actually output a 16-235 patchscale in Resolve. Can anyone confirm this? My 'Lightspace Calibration' inside Resolve says (255,255,255).

I'm sorry if I don't understand it all, I'm not too technical.
Something I figured out last night and verified with external scopes also.

When you are using iTPG of Resolve controlled from ColourSpace via DeckLink output SDI/HDMI, with a video data timeline and ColourSpace patchscale 0-255, an LG OLED will receive 64-940 (video level patterns).

If we want to talk specifically, using a DeckLink Monitor 4K HDMI output with 2160p24 video timeline, LG will receive RGB 10-bit (or 12) when the SDI4:4:4 is ticked, and YCbCr 4:2:2 10bit with SDI4:4:4 unticked when TV HDMI black level is at LOW.

LG OLEDs internally have 64-1023 LUTs.

So to generate these patterns, it will require PGenenerator or an external RGB bit-perfect generator.

However, I have found a method, which has verified with external scopes also to send 64-1023 patches from Resolve iTPG, but it will work only with a DeckLink card with HDMI output and only when its enabled the RGB output of the Decklink.

It will not work when you will use DeckLink SDI and then a Convertor to HDMI.

For DeckLink to able to send RGB, it will require to tick the SDI4:4:4 setting.

You can confirm that LG gets RGB using HDMI Diagnosis hidden menu.

When you want to calibrate LG internal LUT, ideally, you need to use RGB 64-1023 patch generation to match the internal LUT range.

For Resolve iTPG, to able to send 64-1023 patches, you have to set PC levels the timeline and add from ColourSpace as an offset to patchscale 16-255. (TV HDMI black level is at LOW.)

So iTPG of Resolve will work in 0-1023, and the ColorSpace will add the offset for the LG to receive 64-1023 patches.

The procedure us to pre-calibrate the LG with 64-1023 patches (Resolve SDI 4:4:4 ticked, Data Levels timeline + ColourSpace patchscale 16-255) and profile also. (TV HDMI black level is at LOW.)

After loading the 3D LUT correction to the TV, you can change the resolve timeline to Video levels, allow sub-black, and use ColourSpace patchscale 0-255, so the verification will be performed to 64-940 range. (TV HDMI black level is at LOW.)

Note, it will work only with DeckLink with native HDMI output without convertors, only with an RGB output, not YCbCr.

About HDMI Diagnostics Hidden Menu: https://www.avsforum.com/threads/2019-l ... t-58775690
 
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