Originally Posted by jrref
I finally got my LG C8 from VE and below is my initial impressions of Calman's autocal beta.
With LG Autocal there are two new workflows:
LG TV SDR Calibration and LG TV HDR Calibration.
With the SDR workflow you can autocal the following Picture Modes:
With the HDR work flow it is split to include HDR10 and Dolby Vision. The first page lets you select with you want to calibrate. You can calibrate the following Picture Modes:
Dolby Vision Cinema
Dolby Vision Cinema Home
Dolby Vision Game
The workflows are similar to what we are familiar with but now you need to select the LG TV that you want to connect to in the Display Control Tab and give it the IP address of the TV. From my experience you can hardwire or use Wifi (as long as its not congested) to connect. Once Calman connects, a window on the TV will appear with a Pin number that you need to enter in the Display Control Tab. Once done then Calman has direct access to the TV's internal interface along with your meter and pattern generator as usual.
In the Display Control Tab it will show you are connected to the LG 2018 Alpha9 or Alpha 7 OLED, etc. Under that there are three selections:
Display Mode selection where you select which Picture Mode you want to calibrate like Cinema or Technicolor for example.
Active Grayscale Points where you select LG 26 or LG 42 Gray Scale SDR or HDR calibration.
3D LUT Calibration where it is set to 33 points. (When you get to the CMS layout and start Autocal, a pop-up appears where you can select Matrix, Lightning or the iRP Time or Point Based 3D LUT.)
What's interesting to note is autocal's 26 point gray scale layout does not use the traditional 10 or 20 pt IRE's. It increases the scans in the lower IRE's in an attempt to perfectly calibrate near back so you don't have to "play" with the brightness control any more. Your leave Brightness at the default of 50 and Contrast at 85 and autocal. I can confirm that this does work because when looking at content on the LG next to my A1E, near black details look essentially identical.
The Gray scale for the 26 pt are as follows:
Also there is no 2 pt calibration, i guess because it's not needed.
Once everything set up for the 1D Grayscal LUT Calculation in the Display Control Tab, before you start Autocal you need to click the Full DDC Reset button at the bottom of the Display Control Tab. This resets the tables in the TV before you start, initiating Autocal. Then all you do is click the autocal button in the lower right control in the workflow. Calman will then methodically start adjusting all the IRE's. I tried to figure out the high level algorithm from just looking at the process but basically it selects a predetermined route through the gray scale vs starting from 109% and working it's way up from 0% like a traditional calibrator would do. Also when it's working on a specific IRE, it will continue to make adjustments until it's satisfied that it reached it's goal where ever that's set internally. That means you need a pattern generator to generate the patches and can't use patterns from a DVD for example because you don't know which one Calman is going to need.
After a couple of minutes, autocal completes and at that point you can use the DDC controls to make any adjustments. I found that although Autocal did a good job with the grayscale, when you open up the RGB Balance graph scale to look at the details, although the DeltaE is around 2.0, it's not very flat and i had a crazy peak in the gamma at 90% ish. That said i would like to see a feature where the user can select additional scans where autocal can start at 109% and work it's way up from 0% further reducing the errors like i did manually using the DDC controls. It took me about 10 minutes and 2 additional manual scan adjustments to flatten out the graph and reduce the errors to what i would normally do manually.
Once you are done with the Gray Scale then you can check your luminance levels and move on to the 3D LUT (ColorCube) Calibration layout. This Layout is a little confusing because although it has notes about the 3x3 matrix, Lightining and iRP Time or Point Based 3D LUT, you can't select which one you want to use until you start autocal and a pop-up box appears where you can make the selection. I used the Lightning LUT which takes 101 measurements. When the process starts Calman takes many readings and then calculates the LUT and stores it so having a fast meter helps with this process. The only thing that i didn't like was after all the patches were read, Calman leaves a blue patch up while it's making it's calculations. When calibrating HDR you don't want a bright patch left up for all that time. I hope Portrait removes the Blue patch while making the calculations in the next Beta.
After the 3D LUT is performed you can run a Color Checker, Saturation Sweep and final Calibration summary scans as with the usual workflows to verify the work.
Once you are done with Autocal if you want to re-run it again you need to re-click the Full DDC Reset button at the bottom of the Display Control Tab to reset the TV's internal tables and start calibration again.
Calibrating HDR10 and Dolby Vision also worked well but with HDR10 you calibrate the native panel at gamma 2.1 as you do with DV and then the TV applies the Tone Mapping, etc, for HDR. With DV you still need to create a new Configuration file as you do currently but there is a button on that layout which starts the upload once you plug in the thumb drive into the TV. You don't need to go out and into DV PM to initiate the upload like you needed to do on the 2017 LG sets.
As far as the C8's improvements from a calibration standpoint, from my retail sample, the set is amazingly good out of the box but again the gamma will be off if you start changing the OLED light. The traditional user calibration controls are the same as the 2017 sets but Autocal for the average user and the Home Enthusiast with the DDC controls can give you superior results. As for the Pro Calibrators, i think everyone will have their own opinion. I can say that the access to the DDC controls is a huge improvement over the traditional user controls with the remote control. With DDC you are directly manipulating the TV's internal tables bypassing any user layers that may introduce errors or problems.
In looking at familiar content after autocal calibration i was pleasantly surprised that the results looked very good to my eye. I didn't do a deep dive into the content to see if there were any anomalies but i didn't see anything obvious. I'm sure we will get more feedback on this from other users.
Below are my Technicolor and then the DV scans and some screen shots of autocal to give you an idea of the feature.
I see your putting most of your attention into the C8 threads in the OLED Forum after havibg this calibration thread moved to the Calibration Forum, but hopefully this is the correct place to ask my questions.
I see the 26 points you have detailed for the 1D greyscale/gamma LUT from 0% to 109%, but not that you have successfully calibrated a C8 with Autocal, can you confirm that it is 26 points and that these values are correct?
Can you also confirm whether manual controls for greyscale/gamma calibration are classical 21-pt (0%, 5%, 95%, 100%) or whether the C8 offers improved near-black calibration with 24-pt (or higher) including additional points at 3%, 5% and 7%?
I'm hoping to get a better understanding of what improved calibration control/capability the C8 offers to manual DIY calibrators using HCFR or other non-auto calibration solutions compared to 2017 or 2016 WOLED SDR calibration controls (21-pt greyscale/gamna & RGBYMC CMS).