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Saturday November 28, 2009 11:40 AM AEST
Skip Navigation LinksPC Authority > Features > Size matters
FEATURE

Size matters

by Staff Writers  on Jan 1, 1900
Tags: Size | matters
Finally, a few words on image size. The general rule is that a digital image is best with as much of its original resolution as possible. If you crop a digital photo excessively, youre lowering the ov
Finally, a few words on image size. The general rule is that a digital image is best with as much of its original resolution as possible. If you crop a digital photo excessively, youre lowering the overall resolution of that image, as it usually needs to be magnified to fill the same space as the original. The more you magnify, the more imperfections.

One way of regaining resolution is through interpolation. This process works by introducing artificial detail in the form of additional pixels to an image file so a larger file can be created. This happens when using Photo-Paints Resample option to increase the dimensions of an image. Interpolation is often falsely used to claim higher-resolution imaging capabilities in devices like scanners and digital cameras - the more accurate specification will usually be labelled optical resolution.

Interpolation will not improve the quality of an image. All it does is add more pixels to a file and artificially increase its size to fill the new space. But interpolation does have its uses. If an image is physically too small to fill a space, say on a page being prepared for publication, interpolation can be used to increase the image size accordingly. If the quality of the original image was good and size change isnt too great, the result can be acceptable and will avoid excessive pixellation effects. One side-effect of interpolation is a loss in image contrast. You can try to compensate for this, but this usually only converts the side effect into something else.

There are situations when smaller is better. There isnt much point emailing someone a photo that would be too large to fit their screen, for example. Another common mistake on Web sites is to upload images that are larger at 100 per cent than the space they actually occupy when viewed. This reduces the quality of the displayed image, sometimes leads to the picture being squashed and can increase page download times. Its best to re-size an image on a Web page to the exact size as it will be displayed. Downsizing is also performed by Photo-Paints Image | Resample tool. Dont forget that newly downsized images benefit from some sharpening.

Conclusion

In this feature, weve only touched on a whole battery of features that can be used to transform digital photos into amazing images. A package like Corel Photo-Paint 10 is, in a manner of speaking, really only limited by its users imagination.

This article appeared in the April, 2001 issue of PC Authority.
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