Adobe InDesign CS3 - Manual (Page 336)

INDESIGN CS3
User Guide
329
For imported bitmap images, image resolution is determined by the source file. For bitmap effects, you can specify
a custom resolution. To determine the image resolution to use, consider the medium of final distribution for the
image. The following guidelines can help you determine your requirements for image resolution:
Commercial printing Commercial printing requires 150 to 300 ppi (or more) images, depending on the press (dpi)
and screen frequency (lpi) you’re using; always consult your prepress service provider before making production
decisions. Because commercial printing requires large, high-resolution images, which take more time to display
while you’re working with them, you may want to use low-resolution versions for layout and then replace them with
high-resolution versions at print time.
In Illustrator and InDesign, you can work with low resolution versions by using the Links panel. In InDesign you can
choose either Typical or Fast Display from the View > Display Performance menu; in Illustrator you can choose
View > Outline, or change settings in the Display Performances preferences. Alternatively, if your service provider
supports Open Prepress Interface (OPI), they may provide low-resolution images to you.
Desktop printing Desktop printing usually requires images within the range of 72 ppi (for photographs printed on
a 300 ppi printer) to 150 ppi (for photographs printed on devices up to 1000 ppi). For line art (1-bit images), make
sure that the resolution of your graphics matches the resolution of the printer.
Web publishing Because online publishing generally requires images with pixel dimensions that fit the intended
monitor, the images are usually less than 500 pixels wide and 400 pixels tall, to leave room for browser window
controls or such layout elements as captions. Creating an original image at screen resolution—96 ppi for Windows–
based images, and 72 ppi for Mac OS–based images—lets you see the image as it will likely appear when viewed from
a typical web browser. When you’re publishing online, the only times you’re likely to need resolutions above those
ranges are when you want viewers to be able to zoom in for more detail in a PDF document, or when you’re
producing a document for printing on demand.
Importing files from Adobe applications
Importing Adobe Illustrator graphics
How you import Illustrator graphics depends on how much editing the graphics require after you import them. You
can import Illustrator graphics into InDesign in their native (.ai) format.
If you want to adjust layer visibility in InDesign...
Import the graphic using the Place command, and when you want to edit it, choose Edit > Edit Original to open the
graphic in Illustrator. For example, for a multilanguage publication, you can create a single illustration that includes
one text layer for each language. You can transform the illustration as a single object in InDesign but you cannot edit
the paths, objects, or text within the illustration.
Layered file with Spanish and English layers