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Adobe Creative Suite 5 Printing Guide 65

and double-clicking to edit will call up the Camera Raw interface.

Vector Smart Objects can be endlessly transformed without losing data

(because each transform is re-rendered from the embedded vector

data), but raster Smart Objects are subject to some of the same

restrictions as any raster image:

•Rotating the Smart Object will cause some loss of detail, although

subsequent rotations are each re-rendered from the original pixel

data; thus, the transformations are not cumulative.

•Scaling down does not destroy data, although the reduced image will

display less detail because of reduced size; scale the Smart Object

back up to its original size, and the original data is re-rendered without

additional interpolation.

•Scaling up a raster Smart Object past its original size requires interpo-

lation, with a resulting loss of detail. However, Smart Objects oer the

advantage of re-rendering the image data fresh with each transforma-

tion, rather than causing cumulative data loss with multiple transfor-

mations.

Clipping paths

One common method for silhouetting an object in Photoshop is to

draw a vector path with the Pen tool. Traditionally, it was necessary to

designate the path as an official clipping path (by choosing Clipping

Path from the Paths palette menu), and then save the file as a

Photoshop EPS. This is still viable, although it’s no longer necessary to

designate a path as a clipping path; InDesign provides options for using

any saved path within a Photoshop PSD or TIFF file. Saved “regular”

paths offer more flexibility than clipping paths; the user can choose

from multiple saved paths for multiple uses of a single imagewith

different appearanceby changing the use of clipping paths within a

page layout. Such paths can also be edited in InDesign; the original path

is unchanged, but a user-modified instance of the path is used by

InDesign to customize the silhouette. Such flexibility is limited for

clipping paths; InDesign can modify the path to trim out visible parts of

the image, but cannot reveal anything that falls outside the clipping

path. A regular Photoshop path (not designated as a clipping path)

doesn’t have such a limitation; it can be freely edited, to hide or reveal

any part of the image.

Flatness, expressed in device resolution pixels, governs how a device

interprets curved vector paths, using tiny, straight segments. The lower

the flatness value, the more straight segments are used to draw the

curved path, and thus render it more faithfully. The higher the number

of straight segments that must be generated when imaging the curve,

the more processing power is required. But it’s not necessary (or

advisable) for you to make a decision about appropriate flatness

settings for clipping paths. When designating a path as a clipping path,

leave the field blank: the output device will use it own optimum

flatness setting to image curved paths without unnecessary processing.

Path Flatness

Leave the Flatness eld blank, to allow the nal output device to determine optimum

atness for curved paths.

3D content

Photoshop CS5 Extended offers features targeted to engineering,

architectural, scientific, and medical users. While these users may not

seem to be your primary customers, Photoshop images containing

three-dimensional (3D) and video content may be part of many types of

work. The ability to interpret CAD data and produce a 3D rendering in

Photoshop allows product designers to generate photographic product

renderings before products are manufactured.

In addition, Photoshop CS5 Extended introduces 3D Repoussé, which

offers the ability to extrude layer content, including text (which will be

rasterized during the process). The new feature provides options for

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Adobe 5.5 Design Standard Manual de usuario Pagina 67

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Adobe 5.5 Design Standard Manual de usuario Pagina 67

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