DAR, PAR and strange ratios. at DVinfo.net

Go Back   DV Info Net > Windows / PC Post Production Solutions > What Happens in Vegas...

What Happens in Vegas...
...stays in Vegas! This PC-based editing app is a safe bet with these tips.

Thread Tools Search this Thread
Old May 22nd, 2008, 10:15 AM   #1
New Boot
Join Date: Apr 2008
Location: Skovde, Sweden
Posts: 6
DAR, PAR and strange ratios.

Hey guys!

I have a question. I'm just starting to get my head around aspect ratios and how everything works... but still there are some things I just don't get. Any help with this would be very much appreciated.

Normal TV aspect ratio is 1.33, or 4:3, and yeah.. that seems all good for 640x480 for example. But if I would convert this to PAL land for a little while...

SD DV is 720x576. In square pixels this is 786x576 for everything to look right on screen, but this means a DAR of 1.3645?? A true 1.33 ratio would mean 768x576, but this in practice doesn't seem to fit the original footage.
Same thing is true for widescreen for instance. 16:9 which means 1.78. Again DV is 720x576. The PAR for widescreen is about 1.46, which means that in square pixels this would become 1048x576... but this again equals to DAR of 1.82 where you really want 1.78? Again... what you would want seems to be 1024x576 for a 16:9 relationship but this doesn't seem to fit the original image.

Where do I go wrong? Thx a lot!

Also.. why are widescreen computer screens 1.6? Shouldn't they be 1.78??

Last edited by Thomas Johansson; May 22nd, 2008 at 01:52 PM.
Thomas Johansson is offline   Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

Omega Broadcast
(512) 251-7778
Austin, TX

(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

(800) 238-8480
Glendale, CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Windows / PC Post Production Solutions > What Happens in Vegas...

Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -6. The time now is 07:01 PM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2015 The Digital Video Information Network