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JCII - With the cooperation of Japanese camera manufacturers, the Japan Camera and optical instruments Inspection and testing Institute (JCII) was founded in 1954. It was formed to inspect all cameras exported from Japan in order to maintain quality standards.

Joule see Energy

JPEG - An acronym for Joint Photographic Experts Group that describes an image file format standard in which the size of the file is reduced by compressing it. A "JPEG" image file name carries the extension "jpg" - e.g. "portrait.jpg"

Juxtapose - In composition, to place two objects close together or side by side for comparison or contrast. Often helpful in showing scale in an image.