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post #16411 of 16411 Old 09-15-2017, 01:16 AM
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Turboman graciously posted this, I hope it is right.
Good Luck!

Movie mode: further calibration optimization

I have been hesitating between Standard picture mode, and Movie. I really dislike flash lighting/clouding so the dimming in Standard mode in dark scenes helps to hide the clouding. But then darks get crushed which I also dislike.

So following is an attempt to improve move mode to address those problems. I used a new Display3PRO meter which should be quite accurate.

First task is to increase display contrast (not the same as contrast setting). For a given max peak white, if I have higher display contrast, then I can reduce backlight which reduces flash lighting/clouding.
My settings are for a half dark room with peak white around 120cd/m2.
For a given backlight setting, I can increase peak white by increasing contrast setting. In movie mode, I could go up as high as contrast=100 without RGB output hitting a limit, causing clipping as they say. I could also bump up white balance gain to increase peak white without causing clipping. In the end that gave me a peak white of 115cd/m2 with a backlight of 5.
I lowered brightness setting (which influences minimum black) until it just reached a minimum. I did not reduce brightness further because that would crush above black. Brightness setting was then 45 or 46.
With gamma set at +1, I then got almost a constant gamma at 2.22.

BT1886 has the effect that gamma is lowered in dark scenes. This means that darks are a bit brighter than a constant gamma. Visually, I think it helps against flash lighting/clouding because it "lifts up" a dark scene so that flash lighting/clouding becomes less apparent.
Following are calibration results with constant gamma and BT1886 gamma. I achieved the BT1886 target by increasing the setting for 10p white balance at level 1, 2 and 3.

BT1886 gamma at 5% and 10% is not quite smooth. A 20p white balance control would help there.
(Note: PRE=BT1886 and POST=constant gamma)

Following is color calibration. The ES8000 has a very good linearity for different saturation levels.

My settings for Movie are then:
Backlight 5
Contrast 100
Brightness 45
Sharpness 20
All special picture modes and motion modes Off

White balance offset 25, 25, 22
gain 38, 50, 26
Custom Color Space:
R 48, 3, 0
G 4,47,3
B 0, 5, 47
Y 52, 47, 4
C 3,47,50
M 44, 5, 45

For constant gamma:
Gamma +1
10p white balance level 1, 2 and 3: all 0

For BT1886 gamma:
Gamma 0
10p white balance: level 1 all +6, level 2 all +3, level 3 all +1.

(Level 4 to 10: minor corrections. Not worth mentioning)
Edited by turboman123 - 12/13/12 at 9:40pm
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