Why does my head look so fat?
Pixel aspect ratio. Huh? Unless you spend your day immersed in the details of video, this term may cause you to glaze over. But have no fear, it’s actually quite simple. It is often the answer to your more pressing question, “Why does my head look so fat?”
Here’s an example. You have some video footage. You decide to post the video online, and it would be great to grab a still picture from that video to use on your blog post. You crank open your favorite video editing software and save the picture you want.
When it comes time to post the image, something doesn’t look quite right. The picture appears unusually wide, things are stretched out horizontally. But why?
A digital image is made up of many small units called pixels.
On a computer screen, these pixels are square. They have the same width and height. The pixel aspect ratio is 1:1. One unit wide for every one unit tall. Easy to understand, right?
(Image of square pixels)
When you capture video from your camera into your computer, the pixels that are recorded are often non-square. They do not have the same width and height.
For standard definition video, the pixel aspect ratio is considered 10:11. Each pixel is slightly taller than it is wide.
(Image of NTSC non-square pixels)
“But it looks fine when I watch the footage in my video software… Why does the picture look so fat when I save it?
The software is often “adjusting” the playback to look correct on your computer monitor.
When you save the picture, each of those little non-square pixels are stretched out horizontally so that they become squares. Therefore, your noggin looks a little too wide.
(Image of Video on display getting stretched)
“How can I make the picture look correct on my computer?”
You can adjust the width of your picture using your favorite image editing software. You can even do this using Microsoft Paint if you have to.
(Table of Conversions)
At the end of the day, if you are still concerned with the excessive size of your noggin (and it doesn’t have anything to do with video pixels), rest assured that we all are quite special in our design.
I think your head looks very nice.
by Corey Scherbing
Pixel aspect ratio. Huh? Unless you spend your day immersed in the details of video, this term may cause you to glaze over. But have no fear, it’s actually quite simple. It is often the answer to your more pressing question, “Why does my head look so fat?”
Here’s an example. You have some video footage. You decide to post the video online, and it would be great to grab a still picture from that video to use on your blog post. You crank open your favorite video editing software and save the picture you want.
When it comes time to post the image, something doesn’t look quite right. The picture appears unusually wide, things are stretched out horizontally.
But why?
A digital image is made up of many small units called pixels.
On a computer screen, these pixels are square. They have the same width and height. The pixel aspect ratio is 1:1. One unit wide for every one unit tall. Easy to understand, right?

When you capture video from your camera into your computer, the pixels that are recorded are often non-square. They do not have the same width and height.
“Why” is another topic, and if you’re super nerdy about details, Wikipedia should lead you in the right direction.
For standard definition video, the pixel aspect ratio is considered 10:11. Each pixel is slightly taller than it is wide.

“But it looks fine when I watch the footage in my video software… Why does the picture look so fat when I save a picture?
The video software is often “adjusting” the playback to look correct on your computer monitor.
When you save the picture, each of those little non-square pixels are stretched out horizontally so that they become squares. Therefore, your noggin looks a little too wide.

“How can I make the picture look correct on my computer?”
You can adjust the width of your picture using your favorite image editing software. You can even do this using Microsoft Paint if you have to.
Adjusting a video picture to look good on your computer:
Standard Definition:
- Fullscreen 720×480, adjust to 640×480.
- Fullscreen 720×486, adjust to 640×480.
- Widescreen 720×480, adjust to 853×480.
- Widescreen 720×486, adjust to 853×480.
- PAL Fullscreen 720×576, adjust to 768×576.
- PAL Widescreen 720×576, adjust to 1024×576.
High Definition:
- If it’s already 1920×1080, you’re good to go.
- It it’s already 1280×720, you’re good to go.
- Widescreen 1440×1080, adjust to 1920×1080.
- Widescreen 1280×1080, adjust to 1920×1080.
- Widescreen 960×720, adjust to 1280×720.
At the end of the day, if you are still concerned with the excessive size of your noggin (and it doesn’t have anything to do with video pixels), rest assured that we are all quite special in our design.
I think your head looks very nice.