08/08/11 19:23:05 s3CMHmyq
URLﾘﾝｸ(www.adobe.com)
> 2.2.2 Compression
> To reduce file size, PDF supports a number of industry-standard compression filters:
> ・JPEG and (in PDF 1.5) JPEG2000 compression of color and grayscale images
> ・CCITT (Group 3 or Group 4), run-length, and (in PDF 1.4) JBIG2 compression of monochrome images
> ・LZW (Lempel-Ziv-Welch) and (beginning with PDF 1.2) Flate compression of text, graphics, and images