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An aspect ratio is the ratio between the width and the hight of an image. If you had an image that was a perfect square, it would have an aspect ratio of 1:1. One unit of measurement wide by one unit of measurement tall.
If you have a rectangle that is twice as wide as it is tall, you have an aspect ratio of 2:1. Two units of measurement wide by one unit of measurement tall.
The wider the image, the higher the aspect ratio. For digital cameras there are 3 main aspect ratios you're most likely going to come across.
4x3
The size of TVs and most digital point & shoot cameras
Aspect Ratio: 1.33:1
6x4
The size of 35mm film camera negatives and most Digital SLRs
Aspect Ratio: 1.5:1
16x9
The size of HDTV
Aspect Ratio: 1.78:1
If you have a rectangle that is twice as wide as it is tall, you have an aspect ratio of 2:1. Two units of measurement wide by one unit of measurement tall.
The wider the image, the higher the aspect ratio. For digital cameras there are 3 main aspect ratios you're most likely going to come across.
4x3
The size of TVs and most digital point & shoot cameras
Aspect Ratio: 1.33:1
6x4
The size of 35mm film camera negatives and most Digital SLRs
Aspect Ratio: 1.5:1
16x9
The size of HDTV
Aspect Ratio: 1.78:1
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SF Bay Area
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Re: What is an Aspect Ratio?
Mon, June 6, 2005 - 2:05 PMMany digital camera companies have starting calling 6x4, 3x2. They're exactly the same thing, but when you don't know anything about Aspect Ratios and you're comparing two cameras, 4x3 sounds better than 3x2. Heck, you could even fudge it and say four thirds vs two thirds. Most people don't know math well enough to know what all these figures mean anyway.
