Photography glossary - J

Jaggies - Slang term for the stair-stepped appearance of a curved or angled line in digital imaging. The smaller the pixels, and the greater their number, the less apparent the "jaggies". Also known as pixilation.

JAVA - A programming language developed by SUN. Among its features is the possibility to program interactive software for the internet.

JCII - Japan Camera Inspection and Testing Institute. It is an
organization in Japan to monitor export quality of Japanese made
cameras.

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JEIDA - Japan Electronics Industry Development Association. Japanese standards committee for storage cards.

JFIF A specific type of the JPG file format. Also known as EXIF.

JPEG - Joint Photographic Experts Group. Format for compressed graphics files. The de facto standard for image compression in digital imaging devices which enables different levels of compression to be selected. Because brightness information is considered more important than colour data, most pixels only store the brightness information. When the JPEG file is opened, the missing colour data is automatically calculated from the existing information. (MPEG)

Joule - unit used to quantify the light output of electronic flash. A
joule is equal to one watt second of 40 lumen-seconds. The
measure is used to compare flash units in terms of power output.