PSB

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File Format
Name PSB
Ontology
Extension(s) .psb
Released 2003

PSB (Photoshop's Large Document Format) is an image file format supported by Adobe Photoshop CS and later versions of Photoshop. It is a companion format to PSD. PSB supports larger image sizes (up to 300,000×300,000 pixels), and increases various other limits.

PSB is structurally identical to PSD, except that the version number is 2 instead of 1, and some fields are larger (8 bytes instead of 4, or 4 bytes instead of 2).

Identification

PSB files begin with bytes '8' 'B' 'P' 'S' 0x00 0x02.

Specifications

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