Adobe 5.5 Design Standard Manual de usuario descargar pdf (Pagina 71)

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Adobe Creative Suite 5 Printing Guide 69

images). The unattractive rectangular compression artifacts that are

frequently associated with JPEG images do not appear in images

compressed with Maximum quality settings in Photoshop.

That said, it’s generally advisable to avoid editing JPEGs and resaving in

the JPEG format because each resave involves re-compression, and data

can be lost unless the level of compression is carefully chosen. It’s best to

save the file as a PSD or TIFF file, and then update InDesign or Illustrator

files to use the new image.

Another issue with the JPEG format is that it does not offer any support

for layers, spot colors, or alpha channels.

Photoshop PDF

Photoshop (file extension .psd) files are usually created with the intention

of using them in other applications, such as InDesign and Illustrator.

Consequently, the best format for saving images is usually the native

Photoshop (PSD) format. However, in some cases, an image is the final

job, and won’t be placed into another application. While Photoshop’s

native file format is the most flexible option, some customers may wish

to submit a PDF for output.

Because it shares the same PDF libraries as all the other Creative Suite 5

components, Photoshop can save images in the same PDF formats.

However, to maintain fidelity to the artist’s intent and to ensure high-

quality output, suggest to your customers who want to submit

Photoshop PDF files that they start with one of the print-appropriate

options (Press Quality, or one of the PDF/X formats), and then turn off

resampling and compression. Ask the customer to avoid placing any

security restrictions on the PDF file. To ensure that the image can be

edited if necessary, make sure that the Preserve Photoshop Editing

Capabilities option is selected.

Unless the image contains vector or text content, or you wish to submit

the image for comment/review using Acrobat, saving an image as a

Photoshop PDF offers no advantage over saving the image as a

Photoshop native file.

Special Case: Photoshop files with vector content

It’s important to maintain the crisp definition of vector content in a

Photoshop file, whether that content consists of type, Shape Layers, or

vector masks. Three image formats support vector content (PSD, EPS,

and PDF), and it’s important to choose the appropriate format for your

workflow.

A native Photoshop file (PSD) supports the inclusion and editability of

such content. A Photoshop file containing vector content can be

reopened and edited in Photoshop with no loss of data, and can be

placed in other applications. However, vector content in a Photoshop file

placed in Illustrator or InDesign will be rendered as pixels during output

from those applications, thus losing the crisp appearance.

Saving such a file in the Photoshop EPS format preserves vector content

for other applications, but at a price: such a file cannot be re-opened in

Photoshop without re-rasterizing the vector content. If you try to open

such a file, you’ll receive an intermediate dialog box asking for rasterizing

parameters; this is a warning that you will re-rasterize vector content if

you continue. If a customer has supplied such a file, do not attempt to

open and edit the file in Photoshop. Instead, ask that the customer

perform the necessary edits and provide a replacement image. As an

alternative, request that the customer re-save the file as a Photoshop

PDF with no compression or downsampling.

Vector Content

Avoid re-opening a Photoshop EPS containing vector content. All contents of the le—

including text and other vector shapes—will be rasterized, losing editability and le delity.

Saving as Photoshop PDF avoids this problem.

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Adobe 5.5 Design Standard Manual de usuario Pagina 71

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Adobe 5.5 Design Standard Manual de usuario Pagina 71

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