JPEG formats – baseline standard, optimised, progressive

(Taken from the Photoshop help file).

Baseline (“Standard”) uses a format recognized by most web browsers. Best to use this one.

Baseline Optimised creates a file with optimized color and a slightly smaller file size. Not universally supported by browsers.

Progressive displays a series of increasingly detailed versions of the image (you specify how many) as it downloads. Not universally supported by browsers.

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