CurtPalme.com Home Theater Forum

[krisgs]

Hi,
I read the the greyscale calibration guide for dummies recently and find it very good, now I can even see 3D movies without ghost effects. I have a <sony bravia klv serie and I accesed the hidden menu to calibrate and so on all is ok.
Now the calibration is done with my spyder2pro and all went fine.
The only thing that isn't good is my gamma.
My gamma should be somewhere around the 2.2 like the guide tells but I only get 1,6-1,8.
Wat can I do to improve this.
I'll try to post The before after files from hfcr here too

In the normal menu of the Sony I can do gamma correction from 0 to 5.
It is set to 0 and if I rase the number then the picture gets lighter, is this the thing I need and is this as called that gamma booster or so ?

thx very mutch

[Rolls-Royce]

A 1.6-1.8 gamma is lighter than 2.2, so raising the gamma control isn't what you need to do. What is your Y reading at 100 IRE or 100% stim? In most displays, the "contrast" or "picture" control also pulls up "brightness" (black level) as you boost it, driving your gamma number down. They do interact. So, if you have the contrast/picture control set high, it usually will pull up the black level enough to wash out the picture unless you go back and readjust it. I'd suggest rechecking your test pattern source's brightness and contrast patterns, and check the 100 IRE/% luminance with your meter. 30-35 ft/L is a good starting point.

[krisgs]

I've posted the readings normal in the thread as rar file,
The calibrated readings at 100 IRE:

cd/m2:152,75
FTL: 44,584
T° : 6544
X : 145,516
Y : 152,745
Z : 167,918
R : 153,046
G : 152,485
B : 154,437
x : 0,312
y : 0,328
z : 0,360
L : 100
a : 0,4
b : - 0,6
L : 100
C : 0,7
H : 301,4

thx a lot to answer so fast

[Rolls-Royce]

That 44.5 ft/L at 100 IRE is a touch high, IMHO. Others here may disagree with this. I personally have my displays set for about 80 cd/m2 at 100%, but 100 cd/m2 would be a good intermediate point. Unless you're watching in a brightly-lit room, you probably don't need all that light output anyway.

[krisgs]

OK, But has that something to do with the gamma ? And my room isn't really dark, what difference does gamma 1.7 do in opposite with 2.2 ?

[Rolls-Royce]

[krisgs]

OK,got it I think, and that my detail in the dark parts are not like I want is this reason to then ? The low gamma ? So I must now set the ftl to 30 and recalibrate for now ?
So , if this is correct , I'll post my new readings after I done it

[Rolls-Royce]

[krisgs]

EUCHM, so what must I do now then ???

[krisgs]

PFFFT<<, i think i am doing something wrong, can't get higher gamma then 1,7
is this correct:
100% read ftl = 30,...
check Y = 104,...
then
10% set brightness to Y= 104,... * 0,0065 = let's say 0,7
so then I must set ftl at 10% to 0,7 eh correct ?
or must i set Y to 0,7 ? Because if i do so i don't see the bars +2 and +4% grey anymore

[Rolls-Royce]

Digital displays sometimes have a problem with black levels in that they tend to come out of black pretty fast (they are brighter than they should be at low IREs). Digital Video Essentials' HD Basics BD mentions this in its section about setting brightness. You have an artistic choice to make here: adjust 10% to its proper luminance and lose a little very-near-black shadow detail, or run 10% luminance a bit higher to be able to see it. Try it both ways while watching a DVD or BD you are familiar with and see which you like best.

[krisgs]

OK, GONNA TRY IT

THX