Adobe INDESIGN 2.0 - USING HELP Help Manual page 228

Adobe InDesign Help
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JPEG (.JPG)
The Joint Photographic Experts Group (JPEG) format is commonly used to display photo-
graphs and other continuous-tone images in hypertext markup language (HTML) files
over the World Wide Web and in other online media. The JPEG format supports CMYK,
RGB, and grayscale color modes. Unlike GIF, JPEG retains all of the color information in an
RGB image.
JPEG uses an adjustable, lossy compression scheme that effectively reduces file size by
identifying and discarding extra data not essential to the display of the image. A higher
level of compression results in lower image quality; a lower level of compression results in
better image quality, but a larger file size. In most cases, compressing an image using the
Maximum quality option produces a result that is indistinguishable from the original.
Opening a JPEG image automatically decompresses it.
Note: JPEG encoding, which can be performed on an EPS or DCS file in an image-editing
application such as Adobe Photoshop, does not create a JPEG file. Instead, it compresses the
file using the JPEG compression scheme explained above.
JPEG works well for photographs, but solid-color JPEG images (images that contain large
expanses of one color) tend to lose sharpness. InDesign recognizes and supports
clipping paths in JPEG files created in Adobe Photoshop. JPEG can be used for both online
and commercially printed documents; work with your prepress service provider to
preserve JPEG quality in printing.
PICT (.PICT)
The Macintosh PICT (or Picture) format is widely used for Mac OS graphics and page-
layout applications, and for transferring files between applications. The PICT format is
especially effective in compressing images that contain large areas of solid color. InDesign
for both Windows and Mac OS imports PICT files created from Mac OS screenshots and a
variety of other applications, including clipart collections.
InDesign supports RGB PICT images with variable resolutions and embedded QuickTime
images. PICT graphics do not support color separations, are device-dependent, and are
not recommended for high-resolution commercial printing. The PICT format can provide
acceptable quality only when printed on low-resolution or non-PostScript printers.
WMF (.WMF)
The Windows Metafile Format (WMF) is a native Windows format used primarily for vector
graphics, such as clip art, shared between Windows applications. WMF files may contain
raster image information; however, InDesign recognizes the vector information only. WMF
color support is limited to 16-bit RGB, and the format does not support color separations.
It is not an ideal choice for commercially printed or online documents. WMF graphics can
provide acceptable quality only when printed on low-resolution or non-PostScript
printers.
PCX (.PCX)
The PCX format is commonly used in Windows systems. Most Windows software supports
version 5 of the PCX format.
Using Help | Contents
Importing, Exporting, and Managing Graphics
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