Photoshop
Digital Graphics
Dimensions
The number of pixels contained in the width and height of an image are referred to as an image's dimensions. For example, an image might be 400 pixels wide by 200 pixels high (commonly expressed as 400x200).
An image's dimensions have a direct bearing on the resulting file size.
We used our polar bear image again to perform some tests on how the image dimensions affect file size. In each scenario, the image was output as a high quality JPEG. The only difference between them was their dimensions.
| Image Dimensions | File Size (JPEG) |
|---|---|
| 640 x 480 | 52 kb |
| 480 x 360 | 28 kb |
| 360 x 270 | 20 kb |
| 270 x 203 | 12 kb |
As you can see, there is a dramatic effect on the file size of the images. This is something to keep in mind as you're making decisions on your image dimensions.
Dimensions Summary
- The area an image takes up on screen is called its dimensions.
- The dimensions are usually measured in pixels (width x height).
- The dimensions of an image and its resulting file size are interrelated. Larger images will take longer to download on the Web.
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