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Setting up proper contrast

 
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hammerjoe



Joined: 22 Jan 2017
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PostLink    Posted: Tue Jan 31, 2017 1:58 am    Post subject: Setting up proper contrast Reply with quote


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I am trying to improve the image and I have a question about contrast.

Shoud the clipping bars stop at 234 seeing 235 is the reference white, should it be somehwere in the 240's or as far as I can get the contrast on my set show (in my case 250)?
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kal
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Joined: 06 Mar 2006
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PostLink    Posted: Tue Jan 31, 2017 4:25 am    Post subject: Reply with quote

What type of display are you using?

Kal

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hammerjoe



Joined: 22 Jan 2017
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PostLink    Posted: Tue Jan 31, 2017 5:31 pm    Post subject: Reply with quote

Hi,

Its a 4K led panel edge lit?
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kal
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PostLink    Posted: Tue Jan 31, 2017 5:37 pm    Post subject: Reply with quote

Ok. See STEP 2.2.2 here: http://www.curtpalme.com/forum/viewtopic.php?t=35322

Kal

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hammerjoe



Joined: 22 Jan 2017
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PostLink    Posted: Tue Jan 31, 2017 8:26 pm    Post subject: Reply with quote

I dont have that pattern so it doesnt really tell me how far to 255 should I set contrast.
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kal
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PostLink    Posted: Tue Jan 31, 2017 9:20 pm    Post subject: Reply with quote

You need to use patterns. You can't set it without.

Any pattern disc will have something for at 235 and just above/below so that you can set it properly.

Here's one: http://www.curtpalme.com/ChromaPure_Calibration_Disc.shtm

Kal

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hammerjoe



Joined: 22 Jan 2017
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PostLink    Posted: Wed Feb 01, 2017 12:21 am    Post subject: Reply with quote

I have the avs hd disk I just want to know what is the correct setting, clip at 234 or go as high as I can?
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kal
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PostLink    Posted: Wed Feb 01, 2017 1:29 am    Post subject: Reply with quote

Like I said before, you need to do as outlined in STEP 2.2.2 here: http://www.curtpalme.com/forum/viewtopic.php?t=35322
It explains exactly how high to go, tells you what to look for.

Kal

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hammerjoe



Joined: 22 Jan 2017
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PostLink    Posted: Fri Feb 03, 2017 2:18 am    Post subject: Reply with quote

Kal I know I am being dense but I dont have that pattern but reading the tutorial I get the impression that its telling me that I shouldnt try to get clipping all the way to 253 but rather somehwere in the middle between 235 and 255.

Am I right? I have experimented with calibrating my set at about 243.
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kal
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PostLink    Posted: Fri Feb 03, 2017 2:31 am    Post subject: Reply with quote

If you don't have that exact pattern, get a free one like AVSHD709 (Google will give you a link).
It has patterns all around white (235) that will let you set it correctly.

The instructions say:

With Contrast set to its mid-level setting, gradually raise the display's contrast level as high as you can as long as at least one of the "Above Video White" bars is still visible. Under no circumstances should the "Below Video White" bars ever be invisible.

Above Video white is just above 235 (like 236 or 237)
Below video white is just below 235 (like 233 or 234)

Kal

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hammerjoe



Joined: 22 Jan 2017
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PostLink    Posted: Fri Feb 03, 2017 2:44 am    Post subject: Reply with quote

I have the avs hd709 patterns and thats what I am using.
Its interesting, I have been reading about this and there doesnt seem to be any consensus about the proper setting.

I tried with low contrast which clipped white at about 253 and after calibrating I didnt really like the picture so I raised contrast up and she white at about 240.
At this setting I get 40Fl with an already low backlight.
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kal
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PostLink    Posted: Fri Feb 03, 2017 5:14 am    Post subject: Reply with quote

hammerjoe wrote:
I have been reading about this and there doesnt seem to be any consensus about the proper setting.

There will never be any one proper value or setting for any of these because that's the point of calibration: To adjust until you get the desired results. In this case it's without clipping or cutting any of the information.

If there was one only correct setting, there would be no point in allowing the user to adjust. The manufacturer would simply hardcode the setting and not allow adjustments.

Kal

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El Duderino



Joined: 23 Jan 2011
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Location: Portland, OR


PostLink    Posted: Wed Feb 08, 2017 7:16 pm    Post subject: Reply with quote

hammerjoe wrote:
Its interesting, I have been reading about this and there doesnt seem to be any consensus about the proper setting.
In my opinion, this all centers around the BTB (Blacker Than Black) and WTW (Whiter Than White) debate. Specifically what and why it is and how much of it makes it into consumer video distribution.

For modern digitally mastered consumer video (not synthetic test patterns), I'm of the opinion that there is very little BTB/WTW from major studios and what little there is is from filter ringing. AKA mistakes, artifacts, and errors. Clamping a digital at 16/235 removes and 'corrects' them and is the right answer IMO. YMMV.
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kal
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PostLink    Posted: Wed Feb 08, 2017 7:25 pm    Post subject: Reply with quote

El Duderino wrote:
For modern digitally mastered consumer video (not synthetic test patterns), I'm of the opinion that there is very little BTB/WTW from major studios and what little there is is from filter ringing. AKA mistakes, artifacts, and errors. Clamping a digital at 16/235 removes and 'corrects' them and is the right answer IMO. YMMV.

I would agree with that.

Studios do not (or should not) master with BTB or WTW content as displays should not be set up to display it.

Kal

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