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                <h1>
                    Image resolution guidelines for final output
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                <div><div class="section"><p>Bitmap images contain a fixed number of pixels,
usually measured in pixels per inch (ppi). An image with a high
resolution contains more, and therefore smaller, pixels than an
image of the same printed dimensions with a low resolution. For example,
a&#160;1‑inch‑by‑1‑inch image with a resolution of 72&#160;ppi
contains a total of 5184 pixels (72 pixels wide x 72 pixels high
= 5184). The same 1‑inch‑by‑1‑inch image with a resolution of 300&#160;ppi
would contain a total of 90,000 pixels.</p>
<p>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:</p>
<dl><dt class="dlterm">Commercial printing</dt>
<dd>Commercial
printing requires 150 to 300&#160;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.<p>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&#160;&gt; Display Performance menu; in Illustrator
you can choose View&#160;&gt; 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.</p>
</dd><p class="dlseparator"></p><dt class="dlterm">Desktop printing</dt>
<dd>Desktop printing usually requires images within the range
of 72 ppi (for photographs printed on a&#160;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.</dd><p class="dlseparator"></p><dt class="dlterm">Web publishing</dt>
<dd>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&#160;ppi for Windows–based images,
and 72&#160;ppi for Mac&#160;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.</dd><p class="dlseparator"></p></dl>
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