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Adobe Photoshop 2.5 Image Resource Block Format

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The image resource data block stored in various files by Photoshop 2.5 is used to store non-pixel data which may be associated with an image such as pen tool paths. It is referred to as resource data because it holds data which would otherwise be stored in the resource fork of the file on the Macintosh.

It consists of successive blocks of data in the following format:

  1. resource type (4 bytes, most often '8BIM')
  2. resource ID (2 bytes)
  3. resource name (a Pascal format string padded to make the size even)
  4. resource size (4 bytes)
  5. resource data (resource size bytes plus padding to make the size even)

The resolution and path information is stored using the same resource id and format as version 2.0 format used in the Macintosh resource fork.

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