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