Interlaced

Glossary

Interlaced

Interlacing is a method of loading image files in a website in a non-contiguous way. Many images are interlaced during website development of a site. These interlaced images are images where scanlines (rows of pixels) are stored out of any proper sequence. The interlaced images are used for website development so that they are shown rapidly on a fast internet connection. Due to this the users will be unable to distinguish between an interlaced image and a non interlaced image. The interlacing method was widely used for website development in early times. The main aim of using then for website development was to provide a clear view of image in low resolution monitors.

The interlaced images were displayed quickly which gave a false impression of higher bandwidth. Website designers make use of interlaced images to give the readers further encouragement to read their web page content as the loading will be easily visible to them. The image in a progressive scan is generally captured, transmitted and displayed in a path related to text on a page i.e. from top to bottom, line by line. Also, the interlaced scan pattern in a cathode ray tube display completes such a scan but only for every second line. This process is done from the top left corner to the bottom right corner of a CRT display and is repeated again from the second row. This will fill up the gaps that are left behind during the first progressive scan. This type of scan of each second is called interlacing.

During website development, the interlaced images appear quickly but blur. They come into focus gradually as compared to the not interlaced image which appear from top to bottom. Interlacing is also used for website development to compress video. The video signal alternates between even and odd lines and is done on high speed. This will give the user a feeling of smooth video image.

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