-
Interlaced or Progressive
I shoot daily news bulletins from Europe. My end users are Japanese Broadcasters. I shoot Hi-Vision Interlaced 60i on a Sony HDW F900 and have recently decided to give Vegas 6 a try out. Can someone please explain to me the difference or advantage/disadvantage of shooting/editing Interlaced or Progressive?.
-
8 Replies
-
Bottom line is; what do the Japanese Broadcasters require of you?
Gary Kleiner
Learn Vegas and DVD Architect
http://www.VegasTrainingAndTools.com
-
japanese clients require Interlaced 60i. My other clients in UK or USA may require different. What is the difference?.
-
Progressive video means that every pixel on the screen is refreshed in order (in the case of a computer monitor), or simultaneously (in the case of film). Interlaced video is refreshed to the screen twice every frame – first every Even scanline is refreshed (the little gun at the back of your Cathode Ray Tube shoots all the correct phosphors on the even numbered rows of pixels) and then every Odd scanline. This means that while NTSC has a framerate of 29.97, the screen is actually being partially redrawn every 59.94 times a second. A half-frame is being drawn to the screen every 60th of a second, in other words. This leads to the notion of fields. Progressive gives you higher quality but interlaced is the norm for the kind of stuff you are shooting.
-
Nancy…
Many thanks for your ‘in depth reply’…but it begs the question…if “Progressive gives you higher quality” then why do we ever bother about Interlaced? -
Because all (non-HD) broadcast is interlaced and has been from the start. That was what you could do with technology at the time.
—
Terje A. Bergesen -
A little more. Progressive does not give you “higher quality” in all circumstances. Progressive gives you “higher quality” on progressive displays. Digital displays are generally progressive. Your standard “tube” TV is an interlaced format, and the interlaced format was partially developed for smoothness of motion. Progressive tends to get “stroby” during movement at certain speeds, interlaced looks smoother, but not quite as crisp. So, it is a trade off.
The key is, as someone mentioned, what are your customers working with, what are they broadcasting, and what do THEY require from YOU.
-
Many Thanks all……
…..so if I was shooting for display on flat screens or plasma then better to shoot progressive?.
-
If the DVD player that you are to play it on, and the display that will be connected to it supports progressive, then you’d probably be better off shooting progressive.
—
Terje A. Bergesen
Reply to this Discussion! Login or Sign Up