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DV Aspect Ratios

DV & film aspect ratios are discussed as they pertain to DV transfer to film. Pixel dimensions and various resolutions are outlined and how they relate to academy and anamorphic film projection aspect ratios.


Cinema projection aspect ratios are quite different than the video aspect ratio. This means that the video image area must be cropped on the top and bottom to fill the projection screen. The entire video image can be shown in the projection area with no cropping by adding black to the sides of the image, which is called "letter boxing".

If the letter box technique is not utilized, cropping of the video frame will occur. Using the D-1 standard of 720 x 486, Standard Academy Camera Aperture will utilize 720 x 350 and Anamorphic Camera Aperture (a.k.a. Cinemascope, Panavision, and Widescreen) will only use 720 x 274. To avoid losing vital information, all logos and graphics must be kept in these areas. Normally, the image can be repositioned to favor the top or bottom of the image when cropping.


By protecting for these respective areas, you can use the Full Camera Aperture file sizes in both Full and Academy aperture. Please note: It would be advisable to protect for the variation in projection aperture plates. Normally the aspect ratio is 1.85 but you should always protect for 1.66 for international projection practices.

Image aspect ratios can be a confusing issue when going to cinema release, so consult with transfer facility ahead of time with questions to be certain of the process.


Excerpted from: http://www.24fps.com
This article was acquired on the "fair use" basis.
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