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Images are two-dimensional graphical representations. The image itself forms the intellectual or cultural content, and several carrier formats are used for images. They can be divided into the following groups:

Non-projected images

A two-dimensional graphic not intended to be projected for viewing. Examples are: collages, drawings, paintings, prints, photographs and their negatives, technical drawings, charts, flash cards and mixed media. Images may be single occurrences (an original watercolour painting) or may be reproductions (a poster).

Projected images

Projected images are traditionally divided into still images and moving images.

  • Still images: slides, transparencies and film strips. These are projected one image at a time.
  • Moving images: films in reel, cartridge or cassette format, and video-recordings. These are projected in rapid succession to give the illusion of movement.

Digital image files

There are several types of image files: JPG, GIF, TIFF, PNG, BMP, etc. Image files tend to be large; compression levels and the number of colours included are among the factors that determine the size of the file. Image files can be held on servers, PCs and storage media such as floppy disks, CDs and DVDs.

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Content by: Ann Chapman of UKOLN.
Page last revised on: 24-May-2005
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