understanding aspect ratios. what is an aspect ratio? have you ever wondered why some things you...
TRANSCRIPT
Understanding Aspect Ratios
What is an aspect ratio?
• Have you ever wondered why some things you watch on television have black bars around the picture? Do you want to know why the image on your television looks stretched out? The answers to these questions include the term aspect ratio. What is an aspect ratio and how does it affect you? It is the ratio between the width and the height of a film image. Simply stated, it is the size of the picture.
The Most Typical TV Aspect Ratios
• 16:9 (also written 16x9 and said “16 by 9”)– This indicates that the display dimensions
are 16 units wide and 9 units high.– This is also known as widescreen.
• 4:3 (also written 4x3 and said “4 by 3”)– This indicates that the display dimensions
are 4 units wide and 3 units high.
The only two you really need to know
16:9
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
12
6
3
54
8
7
4:31
1 42 3
3
2
Why are there different Aspect Ratios?
• Old Analog Formats are nearly all 4:3 since this was the standard television ratio from the beginning.
• Standard Definition (SD) television continues to be 4:3 although SD can be recorded to appear 16:9 or “widescreen.”
• High Definition (HD) television is always 16:9.
4:3
16:9
Why is this an issue?
• Material in 16:9 format needs to properly fit on a 4:3 television (or 4:3 material on a 16:9 television) without changing its aspect, meaning without stretching or squishing the material.
16:9 on a 16:9 display
16:9 on a 4:3 display without adjustments
4:3 on a 16:9 display without adjustments
4:3 on a 4:3 display
Converting Material
• In order to avoid a stretched or squished picture the material must be converted. There are several different ways to achieve this.– The techniques to fit 16:9 material on a 4:3
screen include:• Letterbox• Edge Crop• Pan and Scan
16:9 Material on a 4:3 Screen
16:9 Letterbox
16:9 Material Converted to a 4:3 screen
16:9 Material
If a program is letterboxed it will
appear with a black bar above and below the
picture.
16:9 Material Converted to a 4:3 Screen
4:3 Edge Crop
16:9 Material
16:9 Letterbox
If a program is edge cropped the
picture fills the screen and the right and left
edges are lost to view.
Panned Right
16:9 Material Converted to a 4:3 Screen Using Pan & Scan
16:9 Material
If the main focus of the picture is on the right a
program can be panned right with
the left edge being lost to view.
16:9 Material Converted to a 4:3 Screen Using Pan & Scan
Panned Left
16:9 Material
Panned Right
If the main focus of the picture is
on the left a program can be panned left with the right edge
being lost to view.
Converting Material
• In order to avoid a stretched or squished picture the material must be converted. There are several different ways to achieve this.– The techniques to fit 4:3 material on a 16:9
screen include:• Pillar Box• Full Screen Zoom
4:3 Material on a 16:9 Screen
4:3 Material Converted to a 16:9 Screen
4:3 Material
16:9 Pillar Box
If a program is pillar boxed it will
appear with a black bar to the right and left of
the picture.
4:3 Material
16:9 Pillar Box
4:3 Material Converted to a 16:9 Screen
16:9 Full Screen Zoomed
If a program is zoomed in the picture fills the screen and the top and bottom
edges are lost to view.
What happens when you want to watch something on television
besides circles?
Awww! The children at Disneyland!
16:9 Source Material
How do we put them in 4:3 space?
Squeeze? Edge Crop? Letterbox?
No! Probably Not.
How do we put them in 4:3 space?
Letterbox!
Oh, look! Now they’re at Mr. Toad’s Wild Ride.
4:3 Source Material
Stretch? Zoom?
Pillar Box?
How do we put them in 16:9 space?
How do we put them in 16:9 space?
No! Acceptable.
Acceptable.
Why are we telling you this?• Here at Eleven we currently broadcast in SD (with
plans to switch to HD soon). Most of what we air is 4:3 format. However, if we receive material in a 16:9 format we convert it (usually by making it letterboxed) before it gets to your television set.
• If you are watching Eleven on a 4:3 television then the programs will appear just as we are broadcasting them without any adjustments on your set.
• If you are watching Eleven on a 16:9 (or high definition) television then you may have options concerning how you see the picture. If you have not chosen the aspect on your set, your set will choose for you. This means that the best option may not be selected. (Keep reading.)
Eleven on a 16:9 Television
• Since we broadcast in 4:3, your television must convert the picture. Most high definition televisions give the viewer the option of choosing the aspect. It may be a button on the remote labeled “aspect” or in the menu under aspect. Consult your user’s manual for information on your specific television.
Following is an example.
This is what we are broadcasting.Your television is set to stretch the picture. (This may be labeled “wide” or “16:9.”)
Why does everything on my television look stretched out and fat?
A Couple of Options
You can choose to zoom in on the picture.(This may be labeled “zoom.”)
Or, you can choose to have it pillar boxed.
(This may be labeled “normal” or “4:3.”)
A matter of preference
In Conclusion
• If you are watching Eleven on a 4:3 television…– the programs will appear on your screen
just as we are broadcasting them without any adjustments on your set.
– you may see black bars above and below the picture if the program has been letterboxed.
4:3
In Conclusion
• If you are watching Eleven on a 16:9 or high definition television…– you have options for viewing the
programs.– you can change the aspect usually with
a button on your remote or in the menu.
16:9
Stretch Full Screen Zoom Pillar Box