Is DV 720i ?? at DVinfo.net

Brendan Getchel · May 6th, 2003, 02:03 PM

Just as the question says. Is the resolution taken from the vertical or horizontal?

Garret Ambrosio · May 6th, 2003, 02:08 PM

I thought that designation has always referred to Horizontal Resolution making DV 480i.

Boyd Ostroff · May 6th, 2003, 03:03 PM

Actually I thought "horizontal" refers to the number of pixels per scan line (720) and "vertical" refers to the number of scanlines (480)... but I'm still new at all this stuff :-)

I was under the impression that 720i was 720x1080, presumably anamorphic 16:9 but that's always been a source of confusion for me too. Maybe someone can post a link to a website that explains all these different standards?

Garret Ambrosio · May 6th, 2003, 03:27 PM

Boyd, I think you may be right...but isn't it L X W Length meaning vertical (720) Width being horizontal(480) and the designation refers to horizontal resolution since this is what they usually use a standard of measurement? I don't know...someone else please help!!

Alex Knappenberger · May 6th, 2003, 03:33 PM

Nope.

DV and standard TV broadcasting is 480i. There are 2 kinds of HD, 720P and 1080i, people are still debating on whether 720P or 1080i is better.

Dennis Adams · May 6th, 2003, 04:11 PM

480i = SD (DV & DVD), 720 x 480, 60 fields per second.
480p = SD, 720 x 480, 24, 30, or 60 frames per second.
720p = HD, 1280 x 720, 24, 30, or 60 frames per second.
1080i = HD, 1920 x 1080, 60 fields per second.

Some people include the field/frame rate in the designation, like "720/30p" or "1080/60i".

///d@

Garret Ambrosio · May 6th, 2003, 05:13 PM

Ah so I was right...hehe, so the desgination does refer to the horizontal resolution and some will include the frame rate. 480i would be interlaced 720 X 480. In this case there is no debate, obviously, speaking of resolution, and resolution alone, 1080i is better than 720i.

Boyd Ostroff · May 6th, 2003, 06:19 PM

Well I hope somebody that really knows will clear this up, cause I still think that 480 is *vertical* resolution (eg: the number of lines that are resolved when you move from the top to the bottom of the screen in the vertical direction).

When they give camcorder specs they mention the number of horizontal lines that are resolved. For example, the PD-150 has a stated horizontal resolution of 530 lines. I thought this meant that you could see (theoretically) 530 dots in a row across the 720 pixel width of the screen. Otherwise this spec wouldn't make much sense because the image only contains 480 scan lines.

So I think that VERTICAL resolution refers to the number of scanlines (480) and HORIZONTAL resolution refers to the number of pixels (720) on each line. This matches the terminology used on Adam Wilt's website as well...

Dennis Adams · May 6th, 2003, 06:24 PM

<<<-- Originally posted by Garret Ambrosio : In this case there is no debate, obviously, speaking of resolution, and resolution alone, 1080i is better than 720i. -->>>

There is no ATSC spec for 720i; all the 720 line formats are progressive.

///d@

Garret Ambrosio · May 6th, 2003, 06:32 PM

Arghh, this is more difficult than I thought. Wouldn't scan lines be the horizontal resolution? Anyone?

Jeff Donald · May 6th, 2003, 08:49 PM

NTSC video has 525 lines from the top of the screen to the bottom of the screen. These lines are referred to as vertical resolution because they are counted vertically, from top to bottom. This number is fixed by the NTSC spec.

Horizontal resolution is measured or expressed as a number of black to white transitions or lines that can be differentiated (resolved). The lines run vertically but are counted across (horizontally). Horizontal resolution is limited by the bandwidth of the video signal or the equipment (lenses, chips, tape etc.).

Rob Lohman · May 7th, 2003, 05:36 AM

What you are all talking about is the VERTICAL resolution
(480i, 720p, 1080i etc.)

May 6th, 2003, 02:03 PM	#1
Brendan Getchel Regular Crew Join Date: Apr 2003 Location: Waterbury, CT Posts: 101	Is DV 720i ?? Just as the question says. Is the resolution taken from the vertical or horizontal? __________________ Dumb Guy.

May 6th, 2003, 02:08 PM	#2
Garret Ambrosio Major Player Join Date: Mar 2003 Location: Vallejo, CA Posts: 263	I thought that designation has always referred to Horizontal Resolution making DV 480i. __________________ "USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." -David Letterman

May 6th, 2003, 03:27 PM	#4
Garret Ambrosio Major Player Join Date: Mar 2003 Location: Vallejo, CA Posts: 263	Boyd, I think you may be right...but isn't it L X W Length meaning vertical (720) Width being horizontal(480) and the designation refers to horizontal resolution since this is what they usually use a standard of measurement? I don't know...someone else please help!! __________________ "USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." -David Letterman

May 6th, 2003, 05:13 PM	#7
Garret Ambrosio Major Player Join Date: Mar 2003 Location: Vallejo, CA Posts: 263	Ah so I was right...hehe, so the desgination does refer to the horizontal resolution and some will include the frame rate. 480i would be interlaced 720 X 480. In this case there is no debate, obviously, speaking of resolution, and resolution alone, 1080i is better than 720i. __________________ "USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." -David Letterman

May 6th, 2003, 06:32 PM	#10
Garret Ambrosio Major Player Join Date: Mar 2003 Location: Vallejo, CA Posts: 263	Arghh, this is more difficult than I thought. Wouldn't scan lines be the horizontal resolution? Anyone? __________________ "USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." -David Letterman

May 6th, 2003, 03:03 PM	#3
Boyd Ostroff Wrangler Join Date: Dec 2002 Location: Mays Landing, NJ Posts: 11,797	Actually I thought "horizontal" refers to the number of pixels per scan line (720) and "vertical" refers to the number of scanlines (480)... but I'm still new at all this stuff :-) I was under the impression that 720i was 720x1080, presumably anamorphic 16:9 but that's always been a source of confusion for me too. Maybe someone can post a link to a website that explains all these different standards?

May 6th, 2003, 03:33 PM	#5
Alex Knappenberger High School Student Join Date: Apr 2003 Location: Canton, Ohio, USA Posts: 609	Nope. DV and standard TV broadcasting is 480i. There are 2 kinds of HD, 720P and 1080i, people are still debating on whether 720P or 1080i is better.

May 6th, 2003, 04:11 PM	#6
Dennis Adams Regular Crew Join Date: May 2003 Location: Madison, WI Posts: 123	480i = SD (DV & DVD), 720 x 480, 60 fields per second. 480p = SD, 720 x 480, 24, 30, or 60 frames per second. 720p = HD, 1280 x 720, 24, 30, or 60 frames per second. 1080i = HD, 1920 x 1080, 60 fields per second. Some people include the field/frame rate in the designation, like "720/30p" or "1080/60i". ///d@

May 6th, 2003, 06:19 PM	#8
Boyd Ostroff Wrangler Join Date: Dec 2002 Location: Mays Landing, NJ Posts: 11,797	Well I hope somebody that really knows will clear this up, cause I still think that 480 is vertical resolution (eg: the number of lines that are resolved when you move from the top to the bottom of the screen in the vertical direction). When they give camcorder specs they mention the number of horizontal lines that are resolved. For example, the PD-150 has a stated horizontal resolution of 530 lines. I thought this meant that you could see (theoretically) 530 dots in a row across the 720 pixel width of the screen. Otherwise this spec wouldn't make much sense because the image only contains 480 scan lines. So I think that VERTICAL resolution refers to the number of scanlines (480) and HORIZONTAL resolution refers to the number of pixels (720) on each line. This matches the terminology used on Adam Wilt's website as well...

May 6th, 2003, 06:24 PM	#9
Dennis Adams Regular Crew Join Date: May 2003 Location: Madison, WI Posts: 123	<<<-- Originally posted by Garret Ambrosio : In this case there is no debate, obviously, speaking of resolution, and resolution alone, 1080i is better than 720i. -->>> There is no ATSC spec for 720i; all the 720 line formats are progressive. ///d@

May 6th, 2003, 08:49 PM	#11
Jeff Donald Warden Join Date: Mar 2002 Location: Clearwater, FL Posts: 8,287	NTSC video has 525 lines from the top of the screen to the bottom of the screen. These lines are referred to as vertical resolution because they are counted vertically, from top to bottom. This number is fixed by the NTSC spec. Horizontal resolution is measured or expressed as a number of black to white transitions or lines that can be differentiated (resolved). The lines run vertically but are counted across (horizontally). Horizontal resolution is limited by the bandwidth of the video signal or the equipment (lenses, chips, tape etc.). __________________ Jeff Donald Carpe Diem Search DVinfo.net for quick answers \| Where to Buy? From the best in the business: DVinfo.net sponsors

May 7th, 2003, 05:36 AM	#12
Rob Lohman RED Code Chef Join Date: Oct 2001 Location: Holland Posts: 12,514	What you are all talking about is the VERTICAL resolution (480i, 720p, 1080i etc.) __________________ Rob Lohman, visuar@iname.com DV Info Wrangler & RED Code Chef Join the DV Challenge \| Lady X Search DVinfo.net for quick answers \| Buy from the best: DVinfo.net sponsors