A Technical Comparison between PDF and DJVU
2008-01-15 21:27
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| 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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