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Old sony z4500 whitevalance calibration

603 Views 9 Replies 2 Participants Last post by Rolls-Royce, Jul 10, 2021

Z4500

Discussion Starter · Jul 10, 2021

Apologies I posted this on the lcd segment

Old sony z4500 whitebalance calibration

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Z4500
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2 Posts
Discussion Starter · #1 · 45 m ago

Hi ,
I own this old tv set and I want to calibrate the cinema mode to d65 or as close as possible. Unfortuanetelly I dont own a probe. I know that warm 1 is around 7700 k and warm 2 is 5500 Now, In order to change whitebalance I have to access the service menu which I already know how to do I also tried playing with the settings while first writing down the originals. It has 5 total white levels.

Now my question is: based on this review Sony KDL40Z4500 Review I know that I have a strong red push. I tried lowering the red only but I think too much will affect the gamma. I dont want touch green as it affects the lightness even more and is not suggested by many. What would be the correct move to do if you had a reading like that on the review?
I know that my brightness ,contrast color saturation is set correctly and my backlight also is around 140nits.also my average gamma is 2.2 in cinema mode and goes to around 2.14 in 90%grayscale range.

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Z4500

Discussion Starter · #2 · Jul 10, 2021

My settings : backlight 2
Contrast 80
Brightness 50
Color 47
Sharpness min

Mostly I am afraid that If i remove red from the 5 levels which correspond to 15% 25% 50% 60%, 80-90% gray then the green will be dominant which is the worst to be.

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Rolls-Royce

· #3 · Jul 10, 2021

True red push is a function of the color decoder, not gray scale. It comes from the manufacturer's attempt to offset their blue boost to raise luminance, which screwed up skin tones on screen, and used to be far more common than it is now. Changing white balance is not the correct fix for this and cannot be accurately done by eye in any case.

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Z4500

Discussion Starter · #4 · Jul 10, 2021

Rolls-Royce said:
True red push is a function of the color decoder, not gray scale. It comes from the manufacturer's attempt to offset their blue boost to raise luminance, which screwed up skin tones on screen, and used to be far more common than it is now. Changing white balance is not the correct fix for this and cannot be accurately done by eye in any case.

So there is no point in reducing the red in the white balance service menu?. I tried reducing it in all levels but it makes the screen dimmer and i think it also affects contrast and gamma . There is also this review with measurements that clearly show a red dominance in the grayscale here Sony Bravia KDL-40Z4500 televisie - Hardware Info I dont know if it helps I just think its not wise to invest in a probe for an old tv set like this.

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Z4500

Discussion Starter · #5 · Jul 10, 2021

Also here are my stock white balance settings in the servive menu.
Rgb:
Level 0
138 133 132
Level 1
272 268 265
Level 2
473 465 459
Level 3
671 659 650
Level 4
929 910 897
Clearly the red is set higher by the factory than green and blue so thats why I think if i lower it affects luminance so i think you are mostly right .

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Rolls-Royce

· #6 · Jul 10, 2021

No real point, at least not for red push (true red push does not show on proper gray scale patterns, which do not include color information). Without a known good D65 reference or a probe and software you're literally in the dark.
But a probe and its software can be used for monitor calibration, calibrating other TVs as you get them, etc. It won't be a "one and done" tool.
All the colors will affect luminance since in a non-WOLED display, they are additive. Red + Green + Blue = White.

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Z4500

Discussion Starter · #7 · Jul 10, 2021

Rolls-Royce said:
No real point, at least not for red push (true red push does not show on proper gray scale patterns, which do not include color information). Without a known good D65 reference or a probe and software you're literally in the dark.
But a probe and its software can be used for monitor calibration, calibrating other TVs as you get them, etc. It won't be a "one and done" tool.
All the colors will affect luminance since in a non-WOLED display, they are additive. Red + Green + Blue = White.

Ok one last question do you think it would be wise to bring level 4 rgb uniformly down to bring gamma a little closer to 2.2 as in the review it is around 2.14 on the region of 80-90 % grayscale

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Rolls-Royce

· #8 · Jul 10, 2021

Look, without the meter, you have no idea what your luminance and gamma actually are. You cannot assume that the measurements for the unit in the review are the same as yours, especially as yours now has wear and tear. Also, the way the gamma formula works, small differences between the target and actual luminance have bigger impact the closer you get to 100%. Depending on how small such a difference actually is, you may not be able to even see it. And level 4 might not coincide with 80-90% to begin with. Without a meter, there's no way to know for sure.

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Z4500

Discussion Starter · #9 · Jul 10, 2021

Rolls-Royce said:
Look, without the meter, you have no idea what your luminance and gamma actually are. You cannot assume that the measurements for the unit in the review are the same as yours, especially as yours now has wear and tear. Also, the way the gamma formula works, small differences between the target and actual luminance have bigger impact the closer you get to 100%. Depending on how small such a difference actually is, you may not be able to even see it. And level 4 might not coincide with 80-90% to begin with. Without a meter, there's no way to know for sure.

Ok thanks for your input, I understand that its very hard without a colorimeter. I know for sure that level 4 is 80 90 grayscale as I have read anothers guy calibration guide of a sony w4000 done with a probe so I have done my research. I also have a lg computer monitor set to d65 so i know what it should look like more or less. As a last resort maybe I Will try warm 1 and remove some blue at least maybe it wont affect luminance so much

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Rolls-Royce

· #10 · Jul 10, 2021

It's your display, of course, and you can do what you wish. But it won't be "calibrated".

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