The Idiot's Guide To Aspect Ratio's at DVinfo.net

Go Back   DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Open DV Discussion
For topics which don't fit into any of the other categories.


Reply
 
Thread Tools Search this Thread
Old February 29th, 2008, 04:35 PM   #1
Major Player
 
Join Date: Aug 2003
Location: Dallas, TX
Posts: 431
The Idiot's Guide To Aspect Ratio's

It may have been mentioned here before, but, can someone please give me the Idiot's Guide To Aspect Ratios (e.g. 1.85:1).
__________________
"Get Er Done!!!"
G. Lee Gordon is offline   Reply With Quote
Old March 1st, 2008, 07:49 PM   #2
New Boot
 
Join Date: May 2007
Location: Clemson, SC
Posts: 19
Craig Syverson has a video podcast that he never updates (hint, hint to Craig) called Videogrunt at:
http://gruntmedia.com/videogrunt_directory.html

Since there are only five of them (hint hint to Craig), and they are only about 4 minutes long, it won't take you long to watch them all. Episodes 2, 3, 4, & 5 are all basically about aspect ratio, letterboxing and pan & scan.

Unfortunately Craig never did one on pixel aspect ratio like he said he would (hint, hint, Craig), but screen/picture aspect ratio is very elegantly covered there.

Pixel aspect ratio is a different beast than aspect ratio, and can occasionally bite you in the butt when editing video. If you are on a quest to learn about aspect ratio, make sure you also gain an understanding of pixel aspect ratio.
Scott R. Smith is offline   Reply With Quote
Old March 1st, 2008, 10:54 PM   #3
 
Join Date: Nov 2001
Location: santa fe, nm
Posts: 3,264
Images: 10
hey, don't be intimidated. It's like learning to ride abicycle. Once you get it, you never forget it.
Bill Ravens is offline   Reply With Quote
Old March 4th, 2008, 06:35 PM   #4
American Society of Cinematographers
 
Join Date: Jan 2003
Location: Los Angeles, CA
Posts: 123
The aspect ratio number is just a ratio between height and width, or vice-versa. Film keeps the vertical height to a value of 1, so the horizontal units can be in fractions, whereas Video keeps the ratio in whole numbers.

Hence 4x3 (video) is the same ratio as 1.33 : 1 (divide 4 by 3 and you get 1.33). 16x9 video is the same ratio as 1.777777... : 1 (1.78 : 1).

Some film aspect ratios over the years:
4-perf 35mm Full Aperture (Silent Era & Super-35): 1.33 : 1
4-perf 35mm Sound Aperture (Academy): 1.37 : 1
4-perf 35mm Matted Widescreen: various -- can be matted (using a projector mask) to 1.85, 1.75, 1.66 but 1.85 is the most common
4-perf 35mm Anamorphic Widescreen (CinemaScope): when the image with a 2X horizontal squeeze is stretched back out to look normal, the current shape is 2.39 : 1 (rounded up to 2.40 by some people) but it used to be 2.35 and this is still a common term.
3-perf 35mm Full Aperture: 1.78 : 1
Super-16 Full Aperture: 1.68 : 1

Many formats involve cropping Full Aperture (the maximum possible area that can be exposed on the negative) to different aspect ratios. Super-16, for example, may have a 1.68 : 1 negative but it is often trimmed a little to 1.78 : 1 for transfer to full-frame 16x9 HD, or blown-up to 4-perf 35mm for projecting with a 1.85 projector mask.
__________________
David Mullen, ASC
Los Angeles
David Mullen is offline   Reply With Quote
Old March 4th, 2008, 07:00 PM   #5
 
Join Date: Nov 2001
Location: santa fe, nm
Posts: 3,264
Images: 10
GLG...

Maybe this will help
Attached Files
File Type: zip AspectRatioSamples.zip (240.3 KB, 130 views)
Bill Ravens is offline   Reply With Quote
Old March 5th, 2008, 12:50 PM   #6
Major Player
 
Join Date: Aug 2003
Location: Dallas, TX
Posts: 431
Thanks everyone. Scott, that website was just what I needed.
__________________
"Get Er Done!!!"
G. Lee Gordon is offline   Reply With Quote
Old March 5th, 2008, 05:37 PM   #7
New Boot
 
Join Date: May 2007
Location: Clemson, SC
Posts: 19
Don't you wish Craig would make some more?? Until I saw videogrunt, I had no idea Thomas Edison and George Eastman conspired to make my iPod Video screen 4:3.
Scott R. Smith is offline   Reply With Quote
Old March 5th, 2008, 09:30 PM   #8
Major Player
 
Join Date: Aug 2003
Location: Dallas, TX
Posts: 431
Yeah Craig, make some more!!!
__________________
"Get Er Done!!!"
G. Lee Gordon is offline   Reply With Quote
Old March 14th, 2008, 06:23 PM   #9
Regular Crew
 
Join Date: Feb 2004
Location: Visalia, California
Posts: 41
American Cinematographers Manual goes into each format extensively.
Adam Beck is offline   Reply
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

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. 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 > The Tools of DV and HD Production > Open DV Discussion

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 03:49 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network