[YOUNGJUN WOO]

1.
According to the Calculation way to approach 1000nits, then the measured EOTF is usually likely to be over the Calman EOTF grapgh? Is this normal?

2.
Please explain the below that you said.

” IF PEAK LUMINANCE IS AROUND 1000 NITS, then 50-65% will be at 400- 500 ? NITS (guessing ). ”

[YOUNGJUN WOO]

Do you mean that I have to consider the maximum luminance firstly in calibration before adjusting anything? To adjust EOTF, I have to consider White level and Contrast Enhance like these functions?

[YOUNGJUN WOO]

I would like to know the procedure time in HDR calibration workflow for projectors on Calman.

I understand how to measure the offset value.
However, in order to make a decision of the procedure time when measuring the maximum luminance, the procedure time is the time after adjusting Black level, and 2-point grayscale? or? I think the maximum luminance would be involved in Black level, and Color Temperature.

[YOUNGJUN WOO]

Can you let me know Tyler’s email address?if you know I sent it to Calman, but they didn’t answer.

[YOUNGJUN WOO]

I will take 50~65% of the gray scale!

Is it always around 1000 nits which is a peak luminance for HDR projectors on the Calman report?

That means I set your way of offset calibrating.

Your way of calculation offset always affects peak luminance to around 1000 nits on the report?
(On the attached file, you can see the peak luminance that I draw red rectangle around it.)

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[YOUNGJUN WOO]

Use the White Balance high controls to target about 50-65% stimulus for d65:
Can you give me more details? What do you mean high controls? In this case, 50~65% RGB balances have under 20deltaE. I therefore set stimulus 50~65% on the setting?

[YOUNGJUN WOO]

I would like to know about Color banding when in HDR on projectors.

After the projector was perfectly calibrated, turning on Color Correction(CMS), there are Color Banding on the real picture such as a gradient sky or gray’ things.

Turning off Color Correction(CMS) on Sony VPL-VW270ES, then, the Color Banding is a bit less than turning on CMS. To get rid of, I set Smooth gradation with CMS on. It made a bit better, but the abnormal effects of Banding were never gone. In addition, the Blu-ray player was set with 4:2:0, and 24Hz to take it off. It cause same picture, though. Would you mind if you let me know about?

Please find attached the picture.

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[YOUNGJUN WOO]

I finally got this report that is attached!

The Sony VPL-VW270ES was calibrated with 100 inch screen in a dark room.

According to your way, the nits of the projector was about 64 nits, and I set 16 of offset for the projector’s nits to be multiplied by.

Please check this out.

,and
I have question one more:
In order to get the offset value for being multiplied by. Like you said, the proejctors have to be 100% running at capacity. Color Temperature of Blue would attact on the nits, because of high Blue compared to Red, and Green. Before getting the 100% running at capacity, what Color temperature should I set? Should I set default setting for Color temperature? or Sould I find out which Color temperataure that affacts on high nits?

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[YOUNGJUN WOO]

1.
‘do not look for anything accurate beyond 40-50% of rec 2020.’ that means I only should focus on 50% targets of colors in CMS ignoring beyond 40~50% accuracy like what happened to beyond 60~100% of colors?

2
Please find attached the report of UHZ65.(peak luminance nit = 423.8)

In this case, according to your calculation way, the offset will be 3. However, due to a high gain screen in a perfect dark room, I set 5. Do you think it is ok or? Could you check this report? In my experience, the real projection was pretty good.
(In regard to setting CMS, I focused on 50% target, and considering 60~100% saturation were not too high DeltaE errors.)

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[YOUNGJUN WOO]

Thank you for your help!

VPL-VW270es, VPL-VW760es(Sony), UHZ65(optoma) were usually calibrated by me. Like you said, those of can cover the really small Rec.2020.
Do you mean I must take Rec.709 even though it is for HDR Mode for CMS?
Could you let me know about the good way for adjusting CMS for HDR-projectors?

When it comes to HDR gamma:
The 150 nits that you said is absolute maximum nits value(manufactures informed) or 100% white field pattern that I can measure with K10A? If second one is correct, then, how can I get the value on Calman? I was not able to find out the nits on Calman.

After setting offset which is your method, should I adjust Contrast as possible as the EOTF will be on the Yellow-EOTF(standard point)?

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