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16:9 mode on a 4:3 set...


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11 replies to this topic

#1 of 12 OFFLINE   Kevinkall

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Posted February 11 2004 - 07:03 PM

This is a silly question, but here goes...

When watching a widescreen movie on a 4:3 set and 16:9 mode in enabled should there be two sets of black bars at the top and bottom of the screen? A set of bars for the TV and a set for the movie? I'm gueesing that this isn't right.

#2 of 12 OFFLINE   Jeff Gatie

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Posted February 12 2004 - 12:31 AM

What you are seeing is the set's true black (the outside bars) vs. the incorrect rendering of the black bars on the DVD (the inside bars). You must be viewing a 2.35:1 aspect ratio film, which requires part of the black bars to be recorded on the DVD and the otheer part created by the 16:9 mode. Get a calibration disk and calibrate that display. Your rendered blacks should match the blacks generated by the 16:9 mode after this. Calibration will also give you a better picture and prevent any burnin (if you see two sets of bars, your contrast is probably off the map, which is bad for the set).

#3 of 12 OFFLINE   Michael TLV

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Posted February 12 2004 - 01:45 AM

http://www.hometheat....321#post828321

Greetings

Please read the HT primer ... for the answers ...

Regards
Michael @ The Laser Video Experience
THX Video Systems Instructor/ISF Instructor
Lion A/V Consultants Network - TLVEXP.com


#4 of 12 OFFLINE   John S

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Posted February 12 2004 - 02:18 AM

What ratio widescreen movie? If it is wider than 1.78:1 then you would have this. As indicated proper calibration will make it much less notice-able, if not completely eliminate it.

Doesn't take professional calibration either, just properly setting your picture controls should minimize it or eliminate it entirely.

#5 of 12 OFFLINE   Kevinkall

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Posted February 12 2004 - 02:49 AM

I noticed this last night while watching Bad Boys 2 which is 2.40:1(Anamorphic Widescreen). I have went thru and setup my TV using the Sound & Vision setup disc. My contrast is set at 15/100.

#6 of 12 OFFLINE   Michael TLV

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Posted February 12 2004 - 03:17 AM

Greetings

Any program with an aspect ratio greater than 1.78 or less than ... will yield bars or one type or another ... whether top bottom or left right.

You cannot fit a rectangle into a square box.

Regards
Michael @ The Laser Video Experience
THX Video Systems Instructor/ISF Instructor
Lion A/V Consultants Network - TLVEXP.com


#7 of 12 OFFLINE   Kevinkall

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Posted February 12 2004 - 03:32 AM

Quote:
You cannot fit a rectangle into a square box.

Really? Posted Image

I was unaware that I would be dealing with 2 sets of black bars.

#8 of 12 OFFLINE   John S

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Posted February 12 2004 - 03:46 AM

On anything wider than 1.78:1, just as somebody with a 16:9 set would have one set on such movies also.

How notice-able is it? I can barely make out my native widescreen bars during like all black content.

#9 of 12 OFFLINE   Michael TLV

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Posted February 12 2004 - 04:39 AM

Greetings

"You have taken your first steps into a larger world."

If you set your DVD player to 4:3, you will only have one set of black bars ... (bad idea)

Regards
Michael @ The Laser Video Experience
THX Video Systems Instructor/ISF Instructor
Lion A/V Consultants Network - TLVEXP.com


#10 of 12 OFFLINE   Todd K

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Posted February 12 2004 - 04:42 AM

I asked this question a while back:

http://www.hometheat....hreadid=124601

Seems no one could really give a definitive answer. Should the black bar produced by that section being "off" be the same as the thin black bar being produced by the DVD?

#11 of 12 OFFLINE   John S

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Posted February 12 2004 - 04:55 AM

Interesting, I know when I am in complete dark, I can barely make out my native widescreen bars. There are so many bars going on these days, I guess I just chalk it all up to modern times,

#12 of 12 OFFLINE   Allan Jayne

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Posted February 12 2004 - 05:08 AM

If your primary goal is to eliminate the distinction between the black area outside the 16:9 shaped area on the screen being used for the video frame and the black area outside the 2.35:1 (or whatever) area used for the movie picture, you can adjust the brightness control while watching the movie. This is not necessarily a correct calibration.

To introduce some confusing numbers, the luminance data range on DVD is 0 to 255 where 16 is black and 235 is white and what is outside this range is normally not used. Occasionally the movie may have shadow detail between 0 and 15 while the black bar outside the 2.00:1 or 2.35:1 picture is at level 16. So trying to match the inner black bar to the outer black bar will bury this "blacker than black" picture detail.

Video hints:
http://members.aol.c...ynejr/video.htm
.