Post Production 911

Hey,

Do you have Quicktime movie clips on your website that were shot in 16×9? Guess what, you can save 1/3 of your bandwidth by excluding the (4×3) black letterbox from your Quicktime Movie. Just crop into your Quicktime Movie using After Effects, Quicktime Pro, or similar software and recompress your film without the lame black space that does nothing for your movie except choke the download speed and use up valuable hard drive space. Not only that, but a 16×9 movie looks so much more professional when it is at the right shape and doesn’t have the black bars junking up the composition. And if you think that looks cool, do the same thing with your 1.85 or Panavision Quicktime movies. Welcome to Hollywood, baby!

kirk

The whole aspect ratio thing is way too big to tackle in a single post here, so let me break it down for you to give you (almost) all you need to know.

There are different screen shapes like 1.78 (16×9), 1.33 (4×3 - also called “academy”), 1.85 (the shape of normal theatrical movies), 2.35 (the shape of Panavision movies), and on and on. In fact, when Edison invented motion picture film, he experimented with all kinds of different shapes to see which was the most useful and pleasing. Other folks even toyed with round screens. Whatever.

The there are square pixels and non-square pixels, each of which affects the image presentation shape.

Chicks hate it if they were shot in 1.33 and squeezed down to 1.78. They hate it because it makes them look fat. This is a common site at sports bars when their monitors are high def 16×9 and then the commercials are in 4×3.

Chicks love it when they were shot in high def 16×9 and squeezed into the 4×3 shape; they look tall and skinny like the supermodels they are inside.

So rather than give you all the ways to solve these issues here’s the tip for always getting it right:

1) In photoshop (or using a scanner and construction paper) Make a perfect circle the that is the same height as the original image footage.

2) Do whatever process you intend to do with the real footage, whether it’s converting it, exporting it, burning it to DVD, making a dub or whatever.

3) Check to make sure that the finished test circle after your processing looks exactly like a perfect circle. If it looks like an EGG, then you messed up somewhere. Go play with the settings until you get a perfect circle.

4) Forget reading endless blogs and wikipedia about all the things that could be causing the problem. Just test it a couple times with different settings and behold… A BEAUTIFUL CIRCLE. Kiss it.

Aspect ratio is merely a fancy way to describe the shape of the image. Is it a long, thin rectangle or more like a square?

Think of it as a measurement of the sides of the shape. So 16 x 9 is the same shape of a piece of paper that is 16 inches by 9 inches. Or it’s mathematical equivalent is 1.78 by 1. This is a nice balanced rectangle shape.

Standard definition TV is more like a square. It’s 4 x 3. But not really. It’s close to 4 x 3 so people call it that, but it is actually 1.33 by 1. It’s much more of a square than the 1.78 : 1 rectangle.

Many theatrical motion pictures are shot in 2.35 by 1. That is a really long rectangle called Panavision.

There are so many presentation formats and TV signals and so a lot of re-sizing has to be done to fit all these different rectangle shapes in their destination format.

kirk

HDV is the little brother to broadcast High Def such as HDCAM or D5. It shoots/records in the 16×9 aspect ratio which, for the math inclined is the same as 1.78 : 1 But standard def television uses an aspect ratio of 1.33 :1

So in down-converting the HDV to standard, you basically need to force the shape of a longer rectangle into a the shape of a regular TV which has a more square shape. (see examples below)

The two ways of doing this are to hack off the sides of the rectangle (also called a “center extaction”), which still provides excellent resolution . But in that case, the sides of the picture will be gone. For example, if there is a dinner table scene and one of the actors is far to either side of the frame, they will be cut off.

However, if you want to see ALL the image, then the long rectangle needs to be shrunk down to fit inside the square. This means there is no image at the tops and bottoms of the frame in the standard def tv. It’s letterboxed. The black bars at the top and bottom are just “empty”areas where there is no picture because it has been shrunken down.

Letterbox is widely accepted on broadcast tv these days. Many network shows run this way due to the complications of trying to have different versions for high def and standard def. People are used to it and the filmmaker’s compositions are preserved. So shoot/record/ dub your HDV into letterbox when you put it on a regular tv. It looks cooler, and the dude at the dinner table isn’t cut off.

kirk