When we create new image with image editing software, such as Photoshop or Fireworks, we should decide the resolution of image. Some of us will confused which resolution: usually 72 dpi or 300 dpi. Well, this is an explanation about it.

The Theory of Image Resolution

The spacing of the pixels in an image will determine the resolution of the image. This is measured in pixels per inch (ppi), also called dots per inch (dpi). The higher the resolution, the more pixels in the image. A higher resolution means an image can contain more information and so detail and color transitions can be recorded in greater quantity. Conversely, at a low resolution, where insufficient information has been recorded, an image may appear pixelated. The number of pixels in an image is fixed, which is why resolution decreases as an image is enlarged.

Monitor have a resolution of 72 dpi, which is why most web graphics are produced at this resolution. Low-resolution images are also quicker to download. This is an inappropriate resolution for a printed image. Some magazines will print at a minimum of 300 dpi, but high-end imagesetters can print at 1200 dpi, 2400 dpi, or even higher.

Conclusion

So if you a web designer, 72 dpi is the best solution, while for image printing should choose a minimum of 300 dpi.

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