Panasonic PZ80/PZ85 Calibration Thread (Updated first post) - Page 80

Originally Posted by sonic_blue

Have you tried measuring 5% steps? You might find some funny business going on in between steps. For instance my 10 step IRE graph further up the page looks quite good but doesn't reveal all the weird spikes in between that the 5% graph shows.

Originally Posted by PlasmaPZ80U

I have and for the most part it's simply unnecessary. It does reveal a better picture of the gamma response but the average gamma is not altered in any way.

Originally Posted by sonic_blue

Still a lot better than mine. I think I'm going to have to increase luminance if I want a smoother graph, either by upping picture level (currently at 18.7ftl peak white) or using cinema mode. Honestly though, I don't like either one of those options.

Originally Posted by PlasmaPZ80U

Just out of curiosity, what are your viewing conditions? IMO, even 30 fL peak white is low for anything other than dark-room viewing, with 35 fL being suitable for evening and night viewing. 40 fL is all-around good.

Originally Posted by boum

Now that I have a somewhat decent meter, I have resumed fiddling around with my tv settings. My grayscale has a few peaks, especially with the blue. The peaks are less frequent and are further apart than sonic_blue, but their amplitude is about the same.

I measured grayscale for various contrast values from 45 to 90. Considering grayscale neutrality only, the sweet spot on my set seems to be with a contrast of 85. Too bad I can't stand the "Normal" color temperature, as it is very flat even with lower contrast values.

30 ft/L is at contrast = 46; light output raises quickly (33.6 ft/L at 50, 36.5 at 55), but above 65 (40.6 ft/L) light output does not change much and the gamma starts to decrease. Gamma changes are of about -0.1 for grayscale 60 to 80, with a pronounced dip at 90.

Not exactly sure what I'll try next. I could not yet visually see the gamma dip at 85, but I find it a bit too bright.

Originally Posted by boum

I decided to try another route after having a quick look at the settings recommended by D-nice for the X1 series (here: http://www.avsforum.com/avs-vb/showt...3#post16014003).

Basically, I lowered a lot the values in the service menu - the green drive and cut went down from their factory FC and 80 values by something like 30-35 and then I adjusted red and bue accordingly. Not many blue spikes and overall pleasing results, and it does not hurt my eyes at night anymore. I would need to double check the gamma, as sometimes I get caught in tweaking the grayscale and forget about re-adusting the brightness, which sometimes can make me think the gamma improved, but most of the time it's mainly because the brightness is now too low and am crushing blacks.

This is looking quite good right now. I wonder if this time I'll think the same in a few days

Originally Posted by PlasmaPZ80U

Just to let you know, the only reason the green drives and cuts were lowered was due to a plus green color temperature found on the X1 and S1 models. It's not in any way necessary for the '08 models. Simply lowering contrast would do the same for the blue spikes you were noticing.

Originally Posted by sonic_blue

Does anyone find that setting Colour using 75% windows looks too colourful for HD? I have found this is the case when calibrating a 50PX80A and 42PZ800A using AVSHD. I am always noticing the picture has too much colour on HD, and have witnessed this on all of my devices (xbox 360, tivo hd, upscaling dvd player). I thought this is odd because SD colour looks good using 75% windows.

This makes me wonder, is it correct to use 75% windows for HD or is HD somehow different in this regard? btw I've tried the 100% method but then the colour is definitely too dull.

Any thoughts?

Originally Posted by PlasmaPZ80U

I think what really matters is how you set color. Do you try to get one primary as accurate as possible or do you aim to get all three as low as possible (minimizing the highest error among the three at any given time)? For example, I use 75% color windows and aim to lower blue dE to the lowest value possible.

Originally Posted by PlasmaPZ80U

On a side note you can adjust a given primary or secondary in real-time with updating xyY values plus dE. Simply check "Detect primary colors during user measures" under general preferences and then click continuous measures while displaying a primary or secondary. Make sure your reference color space is Rec 709 before starting though.

Originally Posted by sonic_blue

Well, I was using red primary to set colour as it's the most accurate colour on my tv (DE = 2). What's really strange is that red is the most noticeable difference between HD and SD: HD has more reddish skin tones and computer rendered graphics such as logos and lettering on TV commercials look more intense red when flicking between HD/SD. Does this sound like red push to you?

Originally Posted by sonic_blue

I was thinking, since the colour of red is different for SD and HD, perhaps this is affecting things? To make things fair, wouldn't it be better to set Colour for HD using an SD red (0.630, 0.340) inserted into the HD colour space?

Originally Posted by PlasmaPZ80U

There is a good way to check for color decoding errors. Simply paste your primaries and secondaries plus white (preferably 75% for all) into the blue area of the color corrector tab.

http://www.avsforum.com/avs-vb/showt...7#post15607437

Originally Posted by PlasmaPZ80U

When you put up a red test pattern (75% red window, for example), it simply tells the display to display 75% red, not SD red or HD red. It's the display's native color gamut (and color matrix setting) that determine which definition of red appears on-screen.

Originally Posted by sonic_blue

I am curious to know, when SD red is upscaled to HD red (eg. upscaling DVD players) does the player actually change the digital value of red to reflect the difference between the SD and HD colour matrix?

Originally Posted by mikeyraw

i was thinking about doing kal's calibration guide for calibration, the curtpalme.com one....it says i need access to rgb highend and lowend...where would i find these settings on the 85u

Originally Posted by PlasmaPZ80U

My latest calibration...

http://www.avsforum.com/avs-vb/showt...3#post17356763