A Technical Comparison between PDF and DJVU

Item

PDF

DJVU

Description of Layout

Driven by (a subset of) PostScript

 

Structure (brief)

object based, offset of indirect objects

described with device independent Cartesian coordinate system

Characters

Font-based

Rendering characters as images

Imaging Features

described with device independent Cartesian coordinate system, named graphical elements

 

Vector Graphics

Constructed with Paths, as defined in PostScript,  with various patterns

Not mentioned
Likely not supported

Raster Images
(coding techniques)

1.        ASCII Coding
(somewhat deprecated)

2.        Run-length coding

3.        Dictionary coding, LZW, FLATE, …

4.        Built-in compressor with prevailing image compression standards: JPEG; JBIG(PDF1.4); JPEG2000(PDF 1.5)

1.        3-level text-background
separation, specified IW44
wavelet compression for
background and foreground,  JB2 for bi-level mask image, which takes advantage of the similarity between shapes on the page, e.g.
nearly-identicalness of literal symbols of same character and font.

2.        Arithmetic coding

3.        Progressive loading

OCR

Supported

Supported

Advantage

Vector graphics

Scanned (raster) images
/ documents

high quality and high
compression rate   

Conclusion

One of the most popular and practicable way of presenting book in computer

Excellent compression method for text-based image sequences

Supported elements

[All those supported by DJVU]

Sound

Interactive forms

Javascript programs

Table

Hyper link

Meta-data

DRM

Supported

Not specified

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