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By A.K. Kaul

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In most programmes it is enough to set up a sampling plan covering for example 10% of all images produced by each scanning device during a certain time period (day, week, month). If a specified percentage of the chosen images is found to be incorrect then the whole batch will have to be subjected to control. A quality control programme always covers the master files that are produced and in most cases will also cover other out-puts such as access files, microforms and paper copies. The automated image evaluation tools that are available today are normally not sufficient for materials that are required for cultural and SCientific purposes.

And artifacts. uuEs IN 210T CEl'8TUllY additional categories of metadata are required to support computer navigation and the management of data files. Metadata describing digital images can contain information of different kinds. DeSCriptive metadata for description and identification of information resources Structural metadata for navigation and presentation. Every digital imaging project, however, must choose a designated metadata solution based on its own goals. There are two main approaches to metadata solutions: data management techniques and document encoding.

Cost per item is affects by physical dimension of the source material. resulting in variations in file-size. and cost of disk storage. The processes to make collections accessible. either in a catalogue or on the Web are determined by the selection of a metadata standard. based on the following factors: Extent of existing collection-level description. Need to modify metadata for various user audiences. Compatibility to make collection visible through a Gateway. The cost of metadata or indexing processes are disproportionately high (60% of total cost).

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