Large Document Format (PSB)

The Large Document Format (PSB) supports documents up to 300,000 pixels in any dimension. All Photoshop features, such as layers, effects, and filters, are supported by the PSB format. Currently, if you save a document in PSB format, it can only be opened in Photoshop CS. Other applications and older versions of Photoshop cannot open documents saved in PSB format.

Note: Most other applications and older versions of Photoshop cannot support documents with file sizes larger than 2 GB.

The Enable Large Document Format (.psb) option must be enabled in Preferences before you can save documents in PSB format. There is one exception: it is possible to open an existing PSB file and save it in PSB format even if the Enable Large Document Format (.psb) option is not selected in Preferences. For more information on saving a document in PSB format and selecting the Enable Large Document Format (.psb) option, see Saving large documents (Photoshop).

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