Adobe PHOTOSHOP 5.0, User Manual, Page: 334 / 400

CHAPTER 14 326
Saving and Exporting Images
CMYK images saved in Scitex CT format often
have extremely large file sizes. These files are
generated for input using a Scitex scanner. Files
saved in Scitex CT format are printed to film using
a Scitex rasterizing unit, which produces separa-
tions using a patented Scitex halftoning system.
This system produces very few moiré patterns and
is often demanded in professional color work—for
example, ads in magazines.
Targa
The TGA (Targa
®
) format is designed for systems
using the Truevision

video board and is
commonly supported by MS-DOS color applica-
tions. The Targa format supports 32-bit RGB files
with a single alpha channel, and indexed-color,
grayscale, and 16-bit and 24-bit RGB files without
alpha channels. When saving an RGB image in this
format, you can choose a pixel depth.
TIFF
The Tagged-Image File Format (TIFF) is used to
exchange files between applications and computer
platforms. TIFF is a flexible bitmap image format
supported by virtually all paint, image-editing,
and page-layout applications. Also, virtually all
desktop scanners can produce TIFF images.
The TIFF format supports CMYK, RGB, and
grayscale files with alpha channels, and Lab,
indexed-color, and Bitmap files without alpha
channels. TIFF also supports LZW compression.
When you save an Adobe Photoshop image in
TIFF, you can choose to save in a format that can
be read either by IBM PC-compatible or
Macintosh computers. To compress the file
automatically, click the LZW Compression check
box; compressing a TIFF file decreases its file size
but increases the time required to open and save
the file. Adobe Photoshop also reads and saves
captions in TIFF files. For information on using
captions, see “Adding file information” on
page 313.
Placing Photoshop images in
other applications
Photoshop provides a number of features to help
you use images in other applications. You can use
clipping paths to define transparent areas in
images you place in page-layout applications. In
addition, Mac OS users can embed Photoshop
images in many word-processor files.
For assistance with clipping paths, choose
Help > Export Transparent Image. This
interactive wizard helps you prepare images
with transparency for export to a page-layout
application.