$20 is for Ted’s disc. Pgen just requires you to buy a Raspberry Pi
The qn meant for LG OLED. Need to check if PJ’s picture mode memory works the same. But logically, it shld work the same coming from an engineering standpoint.
It worked the same on the LG HU810
I see. Was that same on your Sony led tv previously. Meaning u calibrate on one picture mode and it applies to all inputs ? I have personally confirmed the inputs are independent on the AU810PB
Y[quote=“sammy, post:284, topic:367, full:true”]
$20 is for Ted’s disc. Pgen just requires you to buy a Raspberry Pi
[/quote]
Yep. Need rasp Pi which is v affordable.
@sammy I have just checked through the thread, can you advise where is it mentioned that the LG Pattern Generator is not bit perfect ? I am not able to see it. They mentioned a lot of it but nothing on LG AU810PB. Can you confirm the source when you claim that LG’s AU810PB/ HU810PB’s internal Generators are not Bit Perfect ? In any case, we dont use the USB slots on the LG, that is inaccurate
Also, this is what i have advised. which is to slot the USB Patterns into the Oppo 205 to Auto calibrate the LG and not the USB slots on the LG. The oppo then sends a bit perfect yCbCr signal for Calman Autocal
The Oppo as Pattern Generator is Bit Perfect, that is why we dont use the USB slots on the LG. & there is absolutely no need to spend money for another external pGen
We want to calibrate the whole video chain, with the oppo in the chain, which is what i have said above. See below
The patterns from LG is accurate. the Oppo is being used here as the pattern generator, and when set to YcBcR 4:4:4 or 4:2:0 is sending a bit perfect patch
the above is exactly what i have advised, we want to calibrate the whole video signal chain, in cinlude the correction, everything, video card output… Thats what i thought was the correct method for calibration… which is also confirmed by Light space above
NO ?
Bryan, I have always been a bit confused by the part where you say that you put the bit perfect patterns into the Oppo 205. Do you mean that you downloaded the file from Portrait Displays, put it on a USB stick and then play it from the Oppo?
That is not my understanding of how LG’s iTPG works. AFAIK, the file from the USB stick is nothing but a blank file. It has no patterns and is just used to trigger HDR or SDR mode. In fact, I have used a pattern from the Spears & Munsil disc to do the same thing when calibrating my HU810. The patterns are built into a ROM on the LG and displayed as a RGB overlay so they are not from the Oppo or USB drive.
Can we just clear up this basic difference in understanding?
HI Sammy,
thats not the case, the Patterns are loaded on the Oppo vide its USB ports and played back for SDR and HDR to trigger the projector into the correct mode. These files carry the signal to the projector either in RGB or YCBCR, depending on what you set on the oppo under the video page. When watching movies, you do the same, you slot in movies onto a hard disk and you play your movies from there, it sends a YCBCR signal to the Projector. The signal that goes through the entire chain, has different bit depth with different players. I have been calibrating it this way for a number of years using the oppo, thats why i was shocked when you mention the patterns were not bit perfect. As i read up the thread you share, claiming Light Space told you , what i am reading is different from what you have described. Thats why i took a screen shot of what he said vs what you have said. They are entirely 2 different aspects. He is talking about Certain source players not being able to put out the correct bit depth for patch patterns. (ie when sending a full / Limited RGB signal, vs sending a YCBCR signal) all the source players are doing it differently with different accuray, that is what he is claiming.
This is why you calibrate with your source in the chain. Like what i have said , same like what Connectedd has mentioned below
You do not use the PJ USB ports to calibrate the display.
I had this same discussion with @Foodie many years ago, when he mentioned to use Chromapure with the laptop to calibrate the screen because of the autocal feature, but i thought it was not correct. The laptop’s video card is not the same as the Oppo RGB signal or Oppo YCBCR signal… The laptop is using the Full RGB 0-255, not YCBCR. There are tons of errors with the Full RGB . The black levels are not correct to begin with. That was my point
As for the LG iTPG not being bit perfect, it was some time back so I don’t have a direct link right now. However, I remember Tyler Pruitt mentioning that the LG projectors used the Alpha 7 processor in the 2020 OLED BX TVs and not the Alpha 9 processor in the 2021 OLEDs. The Alpha 7 LG processors internal pattern generator was not bit perfect from what I recall.
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i see, ok noted. In any case, we dont use this.Anyway, its good that you have mentioned this fast pgen, its worth a look if it can save us all the time from calibration. also bit perfect and able to do post calibration verification. So a lot more benefits to it.
Thanks again for highlighting. Will definitely look into it, doesnt cost a lot and saves us time
Bryan, As I suspected we have a completely different understanding on how the process works. My understanding is that your Oppo sends a YCbCr signal simply to trigger the PJ into the appropriate mode. This can be done via USB or any device sending a blank signal. When controlled by a calibration program (Calman or Lightspace) LG iTPG puts out a RGB signal on top of the YCbCr stream similar to an OSD. The RGB signal completely obscures the YCbCr signal and is what the colorimeter reads.
Since the RGB signal from the iTPG completely obliterates the YCbCr signal coming from the Oppo, it doesn’t matter to the calibration software because the colorimeter never sees what is coming from the Oppo
No, Sony picture mode memory system and how they store the calibration /lut is totally different. Not so advanced as LG.
Many many years ago, Portrait Displays used this approach too. At that time, Calman had the patterns in software with the program and would display them through the PC’s HDMI port to Autocal. They abandoned this approach and no longer do this because the variations in video display cards caused PC based patterns to be unreliable leading to inaccurate calibrations. Since then, they rely on external pattern generators. In LG’s case they adapted the software to control the LG internal pattern generator, but for some unknown reason, still need a signal to trigger the projector into the appropriate mode. When you use an external pattern generator through the HDMI port, the pattern generator triggers the SDR or HDR mode.
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Hi Sammy, yes if you do that with the USB slots, you are not going to get the calibrated profile on HDMI port that the Oppo is connected to. This is why i have mentioned , the inputs are independent of each other. Nothing gets updated on the LUT tables other than the Native App and built in Media Player. (meaning you use the netflix app on the PJ or connect the Hard disk to the PJ and playback the movie) So with the AU810PB, you cannot use the USB slot to calibrate the display. U must use the HDMI with the oppo. The oppo has to be in the chain for the calibration to take place correctly. Thats why i was also confused on how the entire pic modes get reset with all the inputs when you do a DDC reset. On mine, it only resets the respective input. The input where the oppo is connected to.
Anyway, lets not worry too much. Either way, as long as the calibration is working fine its good
Agreed. We have just a difference in understanding on how LG iTPG works. Also, my HU810 works exactly like @Foodie OLED. When running Autocal with Calman, there is only one 3D LUT per picture mode and that 3D LUT is applied to all inputs after Autocal, whether USB or HDMI. Hence, when I calibrate with USB, the identical 3D LUT is applied to all HDMI ports.
The AU810 works differently in your observation.
So good the quality now post calibration with the new aurora engine . The beard looks inky with a nice shade of brown
The skin tones look very natural to the eyes and I can even see the sparkly make up thingy she is using for her eyes
I can also see the blood vessels in the old man’s eyes…
Damn this aurora engine is first class for the Pj owners… so much improvements over the previous calibrated version
Hi all, I am starting my journey on potentially calibrating my LG AU810PB.
Where should i start? I need to buy Calman and a device to measure?
Thank you in advance.
A calman software and a meter yes.
Thanks,
Between X-Rite OEM i1Display or the Portrait Displays C6 HDR2000 is it really worth the cost for the C6?