PSB

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.

Specifications

 * Adobe Photoshop File Formats Specification

Software

 * Adobe Photoshop
 * ImageMagick
 * Konvertor
 * XnView