How To Calibrate Video Reference Displays Without Using LUTs

Calibrating A Reference Display Without Using LUTs Part 2

January 23, 2018

Learn how to calibrate your video reference monitor if you can't load a calibration Look Up Table (LUT) into the display, with CalMAN Studio. It's simple. It's fast. But it does require a professional display to be fully successful.


Series
Day 23: 24 Insights in 24 Days – 2018 New Year Marathon

Using CalMAN Part 7 – Doing a 2-Point Grayscale Calibration

In Part 6 of this series we performed a series of pre-calibration steps. That step ensured our digital image pipeline is accurate. Here in Part 7 we move to the actual calibration, ensuring our display is accurate. And we do it without using LUTs.

Generally speaking, the type of calibration we perform (a 2-Point Grayscale Calibration) is super simple. We are merely calibrating the white point of the display using two test patches: Pure white (or near pure white) and near pure black.

IF your display tracks accurately then adjusting those two patches will bring your display into alignment. In this workflow it is essential that you run the CalMAN series of post-calibration test patches. These will give you the feedback you need to understand if this 2-point calibration is sufficient for your display.

This display is calibrated twice

The first time we calibrate we use the Rec. 709 standard whitepoint of D65. This is the white point you select for non-top emissive RGB OLEDs. Then, to test the Sony’s D65 default setting, we reset the A170 back to default and recalibrate to the OLED Judd Offset. The differences between the two calibrations are obvious and tell us a lot about how Sony sets the ‘D65’ default setting on its OLEDs.

Special Thanks

I want to thank two people for loaning me the Sony OLED we use in this Insight:

  • Tyler Pruit, Portrait Displays – Not only is Tyler instrumental in keeping my CalMAN Studio license up-and-running so I can learn, use, and teach CalMAN… but he put me in touch with Sony so I could learn how to calibrate a Sony OLED. Thanks Tyler!
  • Gary Mandle, Sony Electronics – Gary is a Senior Product Manager and shipped me the OLED used in this Insight. He’s been very patient as I’ve held onto it for about 2 months longer than planned as the ‘stars aligned’ for me to finally record these Insights featuring his display. Many thanks Gary!

About the Sony PVM-A170 used in this Insight

As a colorist, the A170 is too small for my daily needs. But if I practiced my craft on-set – and needed a reference display on a small mobile DIT cart, this display is certainly up to that task. And for the purposes of learning how to calibrate any Sony OLED – it definitely serves its purpose.

As you’ll see in this Insight, this particular A170 calibrates remarkably well. One thing to keep in mind (which I discovered after recording this Insight): This 4-year-old OLED has about 1200 operating hours. If you average those hours across 4 years, this display is running about 6 weeks/year. In other words, it’s fairly young in its lifecycle.

This particular display is a good example of calibrating a display a year into its life. If, instead, it had been seeing 1200 duty hours per year then we can expect it to suffer from the same aging problems of all displays. Keep that in mind as you watch this Insight.

If you want to learn more about the PVM-A170, here’s Sony’s product page and here’s how much the 25″ version will set you back on B&H’s website. And if you’re wondering how much it’ll cost to step up to the high-end version of Sony’s 25″ OLED, price out the BVM-E250A on B&H.

Enjoy!

-pi


Comments

10 thoughts on “Calibrating A Reference Display Without Using LUTs Part 2”

  1. Thanks Patrick for the series of calibration insights. I’m motivated enough from this insight series to get one of SpectralCal License. I believe you are using the Ultimate license. From your personal experience, could you elaborate in the different SpectraCal licenses available for reference monitors?

    1. CalMAN Studio is completely fine for most people. The main features Ultimate has over Studio is ability to create your own CalMAN workflows and Reports, Video Wall workflow, and the Netflix Workflows for facilities in the Netflix NPV program.

      1. Tyler, thanks a lot for your prompt response. I’m studing the differences options available at your website.

        Just to report, recently I have subscribed to this and other insights since day one of thier publication, but I’m not receiving any email notification update.

        1. Willian – currently, you need to manually subscribe to Insights you want to follow. To subscribe to this Insight, look below these comments, below the ‘also on Mixing Light’ section and just above the page footer. You’ll see ‘Subscribe’. Click on that and you’ll get emails whenever a new comment is posted on this Insight.

          1. Thanks Patrick. I did subscribe to the insights previously to your suggestion, reason why I was reporting the issue. I have had the Subscribe button in green with the Check Mark. Since I received this notification via email I believe everything is back to normal.

  2. Awesome. Thanks a lot for these series, Patrick! It is really really helpful for me, because I got my PVM-A250 since October now and I’m currently researching the best way to (re)calibrate it. I always thought I absolutely need a LUT-Box and never understood why Sony don’t have the ability like FSI to upload LUTs. But now you enlightened me and I guess I found the right solution for me. 🙂

    1. Nico, one thing many calibrators will recommend… buy a LUT box a year or so after purchase. Then do a 1D + 3D LUT to feed into the Sony, precisely like you’ve seen in the rest of this series. It’ll get you an extra layer of calibration precision as the display ages.

      1. Thanks for your reply, Patrick! Just noticed it. Sorry! Which LUT box can you recommend? The one from FSI? If I’d buy a LUT box I think it’s great to have 2 separate streams/LUTs so I’m also able to calibrate my bigger client monitor (LG B7) I guess, right? Thanks a lot for your help. Very appreciated!

  3. I have a calman Studio Software and we have the video generator software that goes with it enabling us to use a TB3 or USB 3 BMD or AJA SDI IO box and output test patterns form Calman. It work well and is mor protable if need to calibrate displays while not in an edit suite with resolve installed. Thanks for this series of insights BTW

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