Jaggies

Slang term for the star-like appearance of angled or curved lines in digital imaging.

JCII

Japan Camera and optical instruments Inspection and testing Institute, founded in 1954. Formed to inspect all cameras and lenses exported from Japan in order to maintain quality standards.

JPEG

Acronym for Joint Photographic Experts Group that describes a digital image file format standard in which the size of the file is reduced by compression. A JPEG image file name carries the extension "jpg". JPEG compression is "loosy", meaning it looses some image information as opposed to other formats like TIFF. A "high quality" JPEG file looses less than a "low quality" JPEG file.

Juxtapose

The placement of two objects close together or side by side for comparison or contrast. At times to illustrate the scale in an image, or to contrast old and new, old and young, tall and short, etc.