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Glossary: E

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EIAJ
The Electronics Industries Association of Japan (EIAJ) merged with the Japan Electronic Industry Development Association (JEIDA) on November 1, 2000 to form JEITA.…
Electromagnetic spectrum
The electromagnetic spectrum (EM) is a model listing and classifying the entire range of electromagnetic radiation, with one end of the spectrum listing the EM radiation with the highest frequency and therefore with the most energy, such as gamma rays. The other end of the spectrum lists the EM radiation with the lowest frequency and…
Embedded metadata
See Metadata, embedded
Encoder
An application or algorithm that encodes data, often used for data compression. A decoder is used to play the data, which often entails decompression.…
See Also Decoder; Digitization
Encoding
The transformation of a signal or data into a code by means of a programmed algorithm. The code may serve any of a number of purposes such as transforming analog information into digital form, compressing information for transmission or storage, encrypting or adding redundancies to the input code, or translating from one code to another.…
See Also Bitstream; Digitization
Essential features
Curators and end users perceive digital content items as having a bundle of features, some of which invest the content with meaning or artistic impact, and these are termed significant or essential. There is a risk that these will be lost as digital items are, say, ingested into a repository and migrated over time.…
Exif
Exchangeable image file format (Exif) describes a metadata set to accompany TIFF, JPEG, and RIFF WAV formatted image files. Exif was prepared by the Technical Standardization Committee on AV & IT Storage Systems and Equipment and is Published by the Japan Electronics and Information Technology Industries Association (JEITA ). The Exif 2.2 specification (JEITA…
Exposure
In digital imaging, exposure is the amount of light received by the image sensor. Exposure is determined by the intensity of light received by the sensor (number of photons), and the duration the sensor is exposed to the light; commonly referred to as shutter speed.…
Extended tags
See TIFF header