Originally Posted by ravnet
fafrd pointed me to this thread, thanks!
I've gone through every post and while I understand some of the content, I'm still very new at calibration so I'm trying to get a check to see if I'm on the right path.
Here is what I'm working with so far in terms of hardware/software:
LG OLED65B6P (living room TV)
LG OLED55B6P (bedroom TV)
X-Rite i1display Pro
HCFR (latest released build)
Computer with HDMI Out.
So far my process for calibration is as follows:
1) Turn off all TV extra processing (dynamic color, dynamic contrast, etc)
2) Set TV Gamma to "BT.1886"
3) Set TV Black level to "High"
4) Set Computer to output at RGB full range through HDMI
5) Set Computer ICC Profile to "sRGB IEC61966-2.1", which should disable all LUT/Gamma corrections on PC
1) Set Brightness based on this pattern: http://www.lagom.nl/lcd-test/black.php
. I make sure that all boxes are distinguishable
2) Set Contrast based on these two patterns: http://www.lagom.nl/lcd-test/contrast.php
. I make sure that all color bars are distinct and all white boxes are distinguishable
3) Start up HCFR and set GDI to "0-255" for full range and use a custom white point of x.307 and y.318 based on advice from here: http://shootdatapost.com/blog/2014/5...ay-calibration
4) I then do a 20 point greyscale calibration by setting RGB values for each IRE using the i1Display Pro. To do this I use the constantly updating Window pattern from HCFR and adjusting RGB in real-time
Am I missing any steps here? Some specific questions I have:
- During 20 point greyscale calibration, I don't ever touch Luminance. All my Luminance levels are 0, I only modify RGB values to get everything to 100%. I've read about Luminance targets per IRE level, but I'm not sure what these values should be, am I doing something totally wrong here?
- I know I'm supposed to calibrate the primary colors after doing the 20 point greyscale calibration, but I can't seem to get anything but saturation to work in LG's CMS, and even then my color levels seem wildly off balace, like 3-400% for every primary color (ex. if red pattern is showing, red is 300+% while green and blue are 100%). What's odd is that if I don't touch the CMS and watch some content, the colors look great.
- On HCFR startup, there is an option to load a correction for the i1Display Pro. I just leave everything at default meaning no correction, is this ok?
You have it roughly right, but here's some advice and some nuances.
Get GCD and AVSHD709 test disks (free here on AVS). When the time is right, invest in Ted's Lightspace Disk (worth every penny).
Begin just using HCFR to measure and present patterns through your Bluray Player (don't try to use HCFR generator to start).
Adjust Peak white on OLED by fixing contrast to 85 and adjusting OLED light to get your desired peak white output (Chad and I both like 170 cd/m2). Use Black pluge patterns to adjust Brightness. Cycle back and adjust OLED light again (since these controls are linked).
Now measure 21-OT greyscale and look at both Luminance and Gamma graphs. Turn on red, blue, green displays on these two graphs.
Use the two-pt controls two improve white balance. Use Low controls to get whitepoint of 5% balanced. Now use High control to get 100% balanced. Now cycle back to rebalance 5% with Low, then back to 100% with High, etc. It can often take 4 or 5 cycles to get 2-point to converge.
Now you are ready to try 21-pt. Start by just balancing a single point, perhaps 10% (since 5% is already balanced). You want to get each point balanced and if you just do that first, the Luminance graph should look much better (red, green and blue lines converged) but the gamma graph should look screwed up / nonlinear (like the example I posted in an earlier post).
Dialing-in gamma is a more complex subject and probably for a seperate post. You can try the different gamma settings on the TV to see how they change your graphs. You can see the different options HCFR allows you to set gamma targets. Once you know what gamma setting you want to use on the TV and what gamma target you are aiming for, you can use RGB and/or Adjusting Luminance controls to move lumen output (Y) closer to target all along 21-pt.
Chad and I both set the TV to 2.1 and are defining gamma targets close to BT.1886 using an artificial black level of about 0.037 cd/m2, but in general, once you have mastered the ability to calibrate 21-pt to hitting any specific gamma target, you are going to want to play around, try different gamma functions including Power-Law-Gamma of 2.2 or 2.4 and check the results on content (since it's a matter of taste).
Don't even worry about color/CMS for now. These OLEDs are already close to perfect when it comes to color, CMS is far more complicated (read: easy to screw up), and there is far less 'bang for the buck' than mastering white balance.
Oh, and forget about HCFR generator got now. Black Level should be set to Low as it should be for your Bluray player.
Once you've mastered calibration with reference patterns through Bluray, you're ready to speed things up using the patterns generated by HCFR, but I'd probably suggest to purchase and become familiar with Ted's Lightspace Disk first. It's far to easy to get the wrong patterns coming from HCFR and you need to know how to compare against a known reference before everything gets all screwed up.
I've been doing this for two years now and am only now getting comfortable on using HCFR generator for the bulk of my 'rough-in' calibration and I still use Ted's Lightspace for my final touch-up pass and final check.
Much of the calibration information out there is based on obsolete technologies (i.e.: CRT) and controls (contrast versus OLED Light) so while it is accurate, it is not necessarily the most relevant for calibrating these newer OLEDs.
Case in point is the brand-new Adjustibg Luminance controls on these 2016 OLEDs. I find them very convenient to perform gamma correction following white balance (as I detailed in an earlier post). Until someone demonstrates to me a reason why this is a bad idea, I'm going to let the results (and time savings) speak for themselves...