AVS HD 709 - Blu-ray & MP4 Calibration - Page 152 - AVS Forum | Home Theater Discussions And Reviews
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post #4531 of 4541 Old 08-29-2017, 08:40 AM
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Originally Posted by skschatzman View Post
I think it's recommended to use 100% Saturation/75% stimulus.

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Oh, ok. I chose the rec709 75/75 option in hcfr thinking it was recommended "75%" reference, not realizing the test pattern was 100% saturation. I suppose I could do a custom reference for 100/75, by entering the xy for RGB manually.
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post #4532 of 4541 Old 08-29-2017, 05:06 PM
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Originally Posted by ConnecTEDDD View Post
Hi, there is no content available for SDR 4K REC.2020, everything @ SDR 4K is REC.709, so you can use these patterns of AVSHD without problem.

Dune Player's are suffering for that issue of color clipping, it's something it can't be fixed, it's hardware issue (not for all models).

What your Dune video output colorspace you are using? YCbCr or RGB-Video?
Thanks for replying,
Oh no, That is no fun!

Under Additional Video Settings I was using auto, The options I have are: BT.601, BT.709, RGB-Full, and RGB-Limited.
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post #4533 of 4541 Old 08-30-2017, 12:55 AM
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Thanks for replying,
Oh no, That is no fun!

Under Additional Video Settings I was using auto, The options I have are: BT.601, BT.709, RGB-Full, and RGB-Limited.
Hi, RGB-Limited or BT-709 are the correct options.

I have checked my emails, I have some measurements from DUNE Smart H1 vs. PS4, taking multiple luminance sweeps, to a 100 nit display, at Green channel the Dune was outputting 20 nits more luminance than the green channel luminance of PS4, this is the reason you see that large clipping to green channel which can't be fixed.

I don't have measurements for Solo 4K but I suspect the issue is still unfixed.

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post #4534 of 4541 Old 08-30-2017, 02:37 AM
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Originally Posted by ConnecTEDDD View Post
Hi, RGB-Limited or BT-709 are the correct options.

I have checked my emails, I have some measurements from DUNE Smart H1 vs. PS4, taking multiple luminance sweeps, to a 100 nit display, at Green channel the Dune was outputting 20 nits more luminance than the green channel luminance of PS4, this is the reason you see that large clipping to green channel which can't be fixed.

I don't have measurements for Solo 4K but I suspect the issue is still unfixed.
I thank you sir!
I'll switch to BT-709 and recalibrate with AVSHD .MP4 files, Hope to get better results!
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post #4535 of 4541 Old 08-30-2017, 03:02 AM
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Originally Posted by ConnecTEDDD View Post
Hi, RGB-Limited or BT-709 are the correct options.

I have checked my emails, I have some measurements from DUNE Smart H1 vs. PS4, taking multiple luminance sweeps, to a 100 nit display, at Green channel the Dune was outputting 20 nits more luminance than the green channel luminance of PS4, this is the reason you see that large clipping to green channel which can't be fixed.

I don't have measurements for Solo 4K but I suspect the issue is still unfixed.
One more question if I may.
Should my display be set to BT.2020, auto, or sRGB/BT.709
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post #4536 of 4541 Old 08-30-2017, 03:06 AM
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Originally Posted by LD-838D View Post
One more question if I may.
Should my display be set to BT.2020, auto, or sRGB/BT.709
Set to Auto or BT-709.

Your player don't support BT.2020, there no SDR content 4K REC.2020 to playback also.

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post #4537 of 4541 Old 08-30-2017, 03:24 AM
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Originally Posted by ConnecTEDDD View Post
Set to Auto or BT-709.

Your player don't support BT.2020, there no SDR content 4K REC.2020 to playback also.
That's disappointing....
All these trailers floating around are just 4K?
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post #4538 of 4541 Old 08-30-2017, 03:45 AM
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Originally Posted by LD-838D View Post
That's disappointing....
All these trailers floating around are just 4K?
I can't comment for all trailers around, you can check if the files you have using MediaInfo ; drag-n-drop your file there and you will set a lot of info, colorspace used, bit-depth etc.

Your player don't have REC.2020 output, so this is more important.
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post #4539 of 4541 Old 08-30-2017, 05:39 AM
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Originally Posted by ConnecTEDDD View Post
I can't comment for all trailers around, you can check if the files you have using MediaInfo ; drag-n-drop your file there and you will set a lot of info, colorspace used, bit-depth etc.

Your player don't have REC.2020 output, so this is more important.
Great, Thanks a million!
I was able to correct that green crush with your suggestions.
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post #4540 of 4541 Old 09-17-2017, 04:11 PM
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Originally Posted by ConnecTEDDD View Post
Hi, since you will use CalMAN, AVSHD don't have correct Grayscale patterns which matching the RGB triplets CalMAN's Engine is expecting, as you see to the picture below; it's grayscale RGB Triplets are not matching exact the levels the CalMAN's Engine expects for it's calculations. When you will use it to perform Grayscale calibration your gamma will be slight off to the mid/low-end range because AVSHD's Grayscale patterns are rounding fractional RGB codes down to the nearest integer. DVE disk is doing the exact same thing, so it's not 100% accurate for Grayscale with CalMAN also.



The difference you will have @ gamma calculations for:

5% Gray = -19.22% Luminance error
10% Gray = -9.23% Luminance error
15% Gray = -5.82% Luminance error
20% Gray = -4.10% Luminance error
25% Gray = 3.07% Luminance error
30% Gray = 2.39% Luminance error
35% Gray = 1.90 % Luminance error
40% Gray = 1.53 % Luminance error

You will not have these errors if you use a calibration disk that matches 100% the RGB triplets of CalMAN's Engine.

But except that, AVSHD is a tool that anyone must have to his tools for other things, like a lot of useful patterns that is including.

Also using AVSHD disk for Color Gamut calibration you have 2 options: 75% Color (which has 100% Saturation with 75% Luminance) or 100% Color (which has 100% Saturation with 100% Luminance)

There is no 75% Saturation with 75% Luminance Patterns in AVSHD disk, no ColorChecker SG, ColorChecker SG Fleshtones, ColorChecker Classic, Luminance runs etc...

If you need accurate patterns which matching the RGB targets CalMAN Engine is expecting (to calculate the dE properly) from you to display, see for a calibration disk which designed based to excact targets of CalMAN's color engine.

BTW, there issues with HCFR also, from the AVSHD Saturation Sweeps; using 75% Saturation with 100% Stimulus; the patterns are not matching the RGB Triplets of HCFR engine, they are slight different.

For Example:

AVSHD 50% Red Saturation Pattern has RGB Triplet 190.95.95 but HCFR's Color Engine needs/calculates errors from RGB Triplet 191.96.96, it's 0.42 dE2000 error.

AVSHD 75% Magenta Saturation Pattern has RGB Triplet 203.100.203 but HCFR's Color Engine needs/calculates errors from RGB Triplet 202.99.202, it's 0.36 dE2000 error.
Is your FULL version of LightSpace disk/files have the expected RGB triplet that Calman is looking for? I ask because I want to use it for USB input calibration.
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post #4541 of 4541 Old 09-17-2017, 04:21 PM
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Originally Posted by rotarydude View Post
Is your FULL version of LightSpace disk/files have the expected RGB triplet that Calman is looking for? I ask because I want to use it for USB input calibration.
Hi, sure it's bit-perfect since all the CalMAN Chapters designed based to CalMAN Engine RGB-Triplets and to the same patch order as CalMAN request them. There CalMAN 5 Workflows designed for CalMAN 5 also.

Content between disk/files is exact the same.
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V/P: eeColor 3D LUT Box - P/G: DVDO AVLab TPG
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