Producing PDFs (was Re: Scanned (PDF) original descriptions)

Curtis Clark jcclark at CSUPOMONA.EDU
Wed May 15 09:45:52 CDT 2002

At 07:49 AM 5/15/2002, Eric Dunbar wrote:
>For the creation of PDFs without OCR I suggest using JPEG, saved at 75%
>quality ("very high" in Photoshop) instead of TIFF. The files will be 5-20x
>smaller than the TIFF (2-10x smaller than LZW compressed TIFF) and you will
>hardly lose image quality.

JPEG is inappropriate for black/white text: it saves 16 million colors,
whether you use them or not, and introduces artifacts around the letters at
any useful level of compression. A 1-bit (b/w) TIFF with lossless
compression will almost always be smaller than the equivalent jpeg.

Curtis Clark       
Biological Sciences Department             Voice (909) 869-4062
California State Polytechnic University      FAX (909) 869-4078
Pomona CA 91768-4032  USA                 jcclark at

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