From: Anthony Kirkpatrick MD PhD
Sent: Monday, September 08, 2014 8:46 PM
To: Karen Hahn
Cc: Bryan Hardy (Bryan.L.Hardy@gmail.com)
Subject: Decision to go with 1080i, instead of 1080p, with the two new 4K cameras

Karen:

I revised our web page to reflect our decision to go with 1080i, instead of 1080p, with the 4K camera:

http://rsdfoundation.org/en/sony-4K-camera.htm

Interlacing our video with 60i takes up less data space on your hard drive than 60p, but the quality of objects in rapid motion with non-interlacing 60p is better.

Only PC games and a few special cameras offer 1080p/60 sources, but the slightly better motion detail is not a huge, noticeable difference over 1080i. In other words, you're not really missing out on anything with 1080i, unless you are playing video games.

To minimize the "combing" effect caused by rapid movements, try to avoid fast horizontal panning with the 4K camera and/or jerking action when shooting video. The result of this type of fast movement would look like someone dragged a comb across the fast moving object. Conveniently, this artifact is called combing.

This is a nice 16-second video demonstration of the combing effect:

https://www.youtube.com/watch?v=j29b7B6CSNM

Still confused about the difference between 1080i and 1080p?

http://www.cnet.com/how-to/1080i-and-1080p-are-the-same-resolution/

A Kirkpatrick MD PhD