High-Compression PDF Technology What is High Compression PDF?
Cuminas’ High Compression PDF (HC-PDF) is technology which compresses a raster image PDF at a high compression ratio when created through Scanners and Multifunction Printers. Cuminas has applied DjVu’s state-of-the-art compression technology to HC-PDF, so now anyone can enjoy the benefit of DjVu without needing to install the DjVu Browser Plug-in. HC-PDF conforms to all PDF standards, so it can be loaded through any standard PDF reader.
Please refer to the following whitepaper for details about HC-PDF:
Caminova HC-PDF (DjVu: 70KB)
Caminova HC-PDF (HC-PDF: 78KB)
PDF Versions Supported by HC-PDF
HC-PDF supports PDF versions 1.4 and 1.6. HC-PDF based upon PDF version 1.6 may not be loaded by some older PDF readers, but it provides the highest compression ratio and visual quality.
Similar to DjVu, HC-PDF supports the following three types depending upon the content:
- Composite Type: This is used for color documents with text and graphics. The image is segmented by the segmentor, which realizes the highest compression ratio.
- Photo: This is used for photo images.
- Bitonal: This is used for bitonal documents.
| PDF 1.4 | Composite Type: JPEG (FG/BG) + CCITT Group 4 (Mask) Photo: JPEG Bitonal: CCITT Group 4 |
| PDF 1.6 | Composite Type: JPEG2000 + JBIG2 Photo: JPEG2000 Bitonal: JBIG2 |
File Size Comparison
The following table compares the typical file sizes of file formats with the same visual quality. The size of DjVu and HC-PDF is 1/20 of the JPEG format, and is about 1/5 Adobe Adaptive Compression.
| File Format | Number of Pages | File Size |
| .JPEG File .(Page 1) .(Page 2) |
2 | 1,236 KB （Page 1: 527 KB） （Page 2: 709 KB） |
| DjVu | 2 | 63 KB |
| Caminova HC-PDF | 2 | 69 KB |
| Adobe PDF Adaptive Compression | 2 | 301 KB |
*Adobe, Acrobat, the Acrobat Logo, Acrobat Capture, Distiller, Frame, the Frame logo, and FrameMaker are registered trademarks of Adobe Systems Incorporated.
Product Information
HC-PDF is available in the HC-PDF edition of Document Express Enterprise and Document Express Professional.
We also provide an HC-PDF SDK. HC-PDF is already employed within global companies such as Avision Inc. and Foxit. Please contact us for details about the HC-PDF SDK.