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Adobe Creative Suite 5 Printing Guide 68

Encapsulated PostScript (EPS)

The EPS (file extension .eps) format does not support many of the

features of native Photoshop filessuch as layers, Smart Objects, and

Smart Filters. Traditionally, the EPS format has been favored for images

in which clipping paths are used to silhouette an object, or for images to

be printed as multitone (duotone, tritone, and so on). If your customer

has supplied EPS files, there is no advantage to re-saving them as native

Photoshop files, except to save file storage space, or to take advantage

of the flexibility offered by native Photoshop files. If the image will be

printed to a non-PostScript printer, however, it is advisable to resave the

image as TIFF or PSD, since only the preview of an EPS is rendered to a

non-PostScript printer.

EPS files offer support for vector content, such as type and vector

shapes; the files will print with sharp vector edges when placed in

Illustrator or InDesign. However, reopening such images in Photoshop

re-rasterizes them, and as a result, loses the crisp fidelity of vector

content.

While the EPS format is supported by many page layout and graphics

applications, non-PostScript printers will image only the screen-

resolution preview component of EPS files.

When saving an EPS file, note the options in the Save dialog box:

Preview: Creates a low-resolution image for viewing in other

applications or printing to non-PostScript printers. For an EPS file that

will be shared between Windows and Mac systems, choose the TIFF

preview option. An 8-bit preview is color, while 1-bit previews are black

and white, resembling a fax image; 8-bit previews add more to file size

than 1-bit previews.

Encoding: Determines the way image data is delivered to a PostScript

output device. Encoding options include:

•ASCII (or ASCII85): Select this option if you are printing from Windows,

or if you experience printing errors with other options.

•Binary: Produces a smaller le, but some page-layout applications as

well as some print spooling and network printing applications may not

support images saved with this option.

• JPEG: Compresses the le by discarding image data. Control the

degree of JPEG compression, from JPEG Maximum Quality (slight

compression) to JPEG Low Quality (aggressive compression). Files

with JPEG encoding can be printed only on Level 2 (or later) PostScript

printers. Some devices do not support the printing of separated output

for les using JPEG compression.

Include Halftone Screen and Include Transfer Function: Maintains any

custom screening specification, as well as embedded curves meant to

control the output values (for example, to linearize output and

compensate for device behavior). Many RIPs ignore these attributes.

Transparent Whites: Displays white areas in bitmap EPS files as

transparent.

PostScript Color Management: Converts file data to the color space of

the target device. Do not select this option if you plan to place the

image in another color-managed document. Only PostScript Level 3

printers support PostScript Color Management for CMYK images. To

print a CMYK image using PostScript Color Management on a Level 2

printer, convert the image to Lab mode before saving in EPS format.

Include Vector Data: Preserves vector graphics (including type).

However, vector data in EPS and DCS files is available only to other

applications, and is rasterized if you reopen the file.

Image Interpolation: Applies anti-aliasing to the printed low-resolution

image to improve output when printing to devices such as laser printers.

Joint Photographic Experts Group (JPEG)

While you may regard the JPEG format (file extension .jpg) as primarily

for web use, a JPEG with slight compression can be appropriate for print

(provided the devices and processes in your workflow accept JPEG

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Adobe 5.5 Design Standard Manual de usuario Pagina 70

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Adobe 5.5 Design Standard Manual de usuario Pagina 70

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