Re: file types

["Irene and Lubos Palounek" <PAL@ieee.org>]

> >So I was curious as to what file formats
> >you guys use?

We follow the recommendation in most books and save pictures either in the
Adobe Photoshop PDF file format or in the TIFF file format. We avoid all
lossy compressions except one case:  for pictures in its FINAL form to be
downloaded from the Internet, we use jpeg (to decrease the download time.)

Many image file formats use compression techniques to reduce the storage
space required by bitmap image data. Compression techniques are
distinguished by whether they remove detail and color from the image.
Lossless techniques compress image data without removing detail; lossy
techniques compress images by removing detail. The following are commonly
used compression techniques:

.   Run Length Encoding (RLE) is a lossless compression technique supported
by the Photoshop and TIFF file formats and some common Windows file formats.

.   Lemple-Zif-Welch (LZW) is a lossless compression technique supported by
TIFF, PDF, GIF, and PostScript language file formats. This technique is most
useful in compressing images that contain large areas of single color, such
as screenshots or simple paint images.

.   Joint Photographic Experts Group (JPEG) is a lossy compression technique
supported by JPEG, PDF, and PostScript language file formats. JPEG
compression provides the best results with continuous-tone images, such as
photographs.

.   CCITT encoding is a family of lossless compression techniques for
black-and-white images that is supported by the PDF and PostScript language
file formats. (CCITT is an abbreviation for the French spelling of
International Telegraph and Telekeyed Consultive Committee.)

.   ZIP encoding is a lossless compression technique supported by the PDF
file format. Like LZW, ZIP compression is most effective for images that
contain large areas of single color.

Cheers, Lubos


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