JPEG

What does it mean? Very widely-used picture file format that saves storage space by throwing  away bits of the image and smoothing over the gaps.

Stands for Joint Photographic Experts’ Group

Picture file format that compresses files by smoothing out transitions and throwing away fine detail. When opening a JPEG file, it is good practice to save a working copy in another format for editing, because every time you save a file in JPEG format, yet more image detail will be deleted from the file.

The level of compression can be adjusted when exporting a final, compressed JPEG file. It is a versatile format used extensively in publishing and online. Sample applications include sending compressed, high resolution images by email, low resolution pictures on websites and many budget digital cameras save images in JPEG (.jpg) format to save storage space.

Good to know:

  • Supports RGB and CMYK colour spaces
  • Does not support transparency (rubbish for cutouts)
  • Compression degrades the image (“lossy compression.”) every time the file is saved or exported

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