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:

  1. From the context menu choose Help, then Page Information…. The DjVu Information dialog box appears, as shown below.

    The encapsulated information 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). 

  2. Click Detail>> to see detailed information. The current page’s encoding and compression details are displayed, 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:
  1. From the context menu choose Help. The Help submenu appears.

  2. Choose Document Information…. The Document Information dialog box appears, as shown below.

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.

For more information about this dialog in relation to expired DjVu files, see "Opening Secure DjVu Files".