Category Archives: The science bit

A section about some of the technicalities of photography

How jpeg works

Jpeg stands for Joint Photographic Experts Group and has become the default file format for digital photography and for the internet.

The Jpeg format, whose files are recognisable by their .JPG file extension, are lossy compressed files which means that the data is squashed in such a way that the original file can never be recreated precisely. As such they are not recommended as intermediate files when editing, as each time they are saved some more of the image data is lost.

However the advantage of the Jpeg format is that it can create reasonably small files with a full spectrum of colour, unlike other compressed formats such as .GIF which have a limited palette.

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