According to Calman software, and an I1Pro, The set needs more blue gain.
Have been into the service menu, and found the white balance category, took care to write down all settings before tweaking on them. However, after going through several of the available parameters, while displaying stairstep pattern, am unable to discern any change in drive/bias. Also tried resetting the user white balance controls, then re-entering the service menu to see if any value changes could be noted. None were. Anyone with an idea of what parameters affect the hdmi 1 input, your feedback would be appreciated. Need to bring the overall blue gain up the equivalent of 2-3 points in the user menu, as the user menu value currently is set at zero, but need more latitude for adjusting.

thanks,
schlick

Greetings

Why not just subtract instead of adding. You can get to correct that way too. In fact, on gain controls, it is preferable to take away.

regards

If I remember correctly, the BRAVIA white balance settings are based on whatever you have selected in the user menu, at least for some models. So if you're on Warm 2 and need more blue, try calibrating Warm 1 instead, for example.

As Michael says though, you're better to subtract than to add, so if you need more blue, subtract red/green.

Thanks Michael,
the control offered by subtracting one "unit" on either red or green, (or both), doesn't seem to have a fine enough effect to go where I need, without compromising somewhere else. Perhaps I'm as close as I can get, without tampering in the service menu. Is this a fair assessment?
Thanks,
Schlick

Greetings

It goes up the same as it goes down. What makes you think that going up gets you more precision?

It gets you to the clipping point that much quicker by going up. going down ... there is no fear of clipping the signal or causing discoloration.

If you want ... just take all 3 colors down by 10 clicks and that gives you your upper range again.

Regards

I would not generally assume that shifting all three colors by the same number of units will yield linear results. The response of some systems can get rather tricky when you do so.

Greetings

I did not say linear ... but it does give more range.

Regards

So, by reducing all three gain controls, to midrange (as a starting point), I should be able to achieve a closer/proper higher end white, without affecting the 40-70 unit range too much. Ending up with some adjustment latitude left over, if they do behave in a linear fashion. Am I understanding correctly?

Greetings

It gives you more range without fear of entering the clipping or crushing zone. Does not matter if the decrease is linear or not ... since the grayscale is still off whether you do this or not. But before, you had no more range. Now you do.

Also bear in mind that the calibration system is a two point system. There is no way to directly make 10% to 100% all linearly D65. You pick your two points to work on ... be it 30% on the dark end and 80% on the bright end ... and you cross your fingers. You have no control over 20,40,50,60,70,90,100. Best fit scenario.

Want more precision? Will have to buy an external scaler ... $$$$

Regards

It does matter whether the response is linear or not. On some sets 10 units may be insignificant and simply give you more range. On others it could completely change the response of the controls.

So this approach may or may not solve my problem. It'll be dependent on how the functionality of the user controls is implemented. (linear vs logarithmic)?? Correct?

Thanks,
Schlick

So this approach may or may not solve my problem. It'll be dependent on how the functionality of the user controls is implemented. (linear vs logarithmic)?? Correct?

schlick,

What happens to the grayscale response when you lower all 3 gain controls will be dependent on the implementation behind the controls - what it's affect on the low end will also be dependent on that as well. I'm just an amateur hobbyist but with my Samsung LCD, I've noticed that one tick of the blue offset control seems to have a greater affect across the entire grayscale than one tick of the blue gain control. Overall, the controls don't seem linear. Also, remember that when you do lower everything, it'll lower your luminance.

I think you could try 3 things. Lowering all the gains by the same amount and starting from there, starting from a different preset (e.g. Warm 1 vs. Warm 2) or trying to lower the other two gain controls a bit to bring blue up a bit. I'd probably try what Michael says and see what it presents to you. Doing a few experiments is probably the best way to determine how the Sony's software is behaving.

hope this helps,


--tom

The set needs more blue gain.

Dropping red and green user menu gains a few steps is probably similar to increasing blue gain. Generally Sony offers enough user controls for setting grayscale. The user gains can be set for different inputs, but if you use the service menu you'll probably be adjusting the default color temps.

From the original post it sounds like you may not be using the correct adjustments in the service menu. On the xbr4 the white balance adjustments are under 50 Panel_Gamma.