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Digital Photography Glossary

Photography Glossary - J

Understand the terminology of digital photography, digital printing and digital imaging so that you will become a better photographer. Photographic terms such as Jpeg, Joule, Jaggies, Jfif, and more.

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JPEG

JPEG File Format Compression Ratios

JPEG stands for Joint Photographers Expert Group, and it is a file format for storing digital images with a considerable amount of compression. JPEG is lossy compression method and the amount of compression can be adjusted, with an inverse relationship between image quality and file size. JPEG has a standard compression ratio of 10:1 without any visible loss of image quality. JPEG is the most ubiquitous file format for digital cameras and other photographic image acquisition devices as is saves images to a small, manageable file size and is easily transmitted on CD, DVD, over the web and on websites.

Click here to learn more: Understanding Digital Photo File Formats

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Joule (flash unit)

Joule describes the energy capacity of a flash unit. It has no ability to determine the amount of light hitting a subject nor does it take into account loss of electrical power from mechanical inefficiencies in the flash unit.

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Jaggies

This is the jargon or informal name for digital artifacts found in raster images. These star-line lines appear where there should be a smooth straight line or curve. Jaggies appear when the output device (i.e. printer or monitor) doesn’t have the adequate resolution to reproduce a smooth line.

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JFIF

JFIF (special type of JPG-EXIF) stands for JPEG File Interchange Format. It is a JPEG file encoded to be compliant with JPEG Interchange Format, and it contains image data such as resolution and aspect ratio. JFIF files have a device-dependent RGB color space.

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