Page and Document Information

Using Page Information and Document Information you can see exactly what components your DjVu page or document contains and how they are accessed.

Page Information

The DjVu Information dialog box displays encapsulated information pertaining to the current page.

To view the DjVu Information dialog box:

From the DjVu context menu choose Help, then Page Information…. The DjVu Information dialog box appears.
Click Detail to see detailed information (see below).

The encapsulated information, as shown above, includes page size, what kind of image the page consists of in terms of layers, and a compression ratio (uncompressed 24 bit color / djvu file size).

Clicking the Detail button displays the current page’s encoding and compression details, as shown below.

What the Details Mean

The first line shows the full dimension and resolution of the DjVu image and the file format version. Following are a list of IFF85 Chunks (see specification) which can be interpreted as follows:

Chunk	Description
INFO	Page Information such as dimensions and resolution
CIDa	Creation ID encrypted information about how the file was created
INCL	A reference to an external chunk, not part of the same file
Sjbz	JB2-encoded mask
FG44	IW44 wavelet encoded-foreground
BG44	IW44 wavlet-encoded background
TXTz	Text (searchable)
ANTz	Annotations as defined in the original DjVu Specification
LTAnno	Enhanced annotations
FGbz	“Color JB2” data
NAVz	Document outline information
WMRz	Watermark removal

Document Information

If the current document consists of more than one page, the Document Information dialog box displays information pertaining to the files that make up those pages.

To view the Document Information dialog box:

From the DjVu context menu choose Help. The “Help” submenu appears.
Choose Document Information…. The Document Information dialog box appears.

At the top of the dialog is information describing the multiple-page format of the file – direct or bundled. The tabs on the lower half of the dialog list the various files that make up the document. If the document makes use of “shared” thumbnails or JB2 shape dictionaries then the “size” is “unknown.” Note that bundled DjVu documents wrap up all the files listed into one entry in the file-system. For indirect files, file listed corresponds to an actual file-system file.