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            <div class="Photoshop"><table><tr><td class="banner">Adobe Photoshop CS4</td><td class="pod"><img src="images/PDF.gif" width="16" height="16" hspace="15" valign="50%" />&#160;&#160;
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                <h1>
                    About printing
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                <div><p>Whether
you are printing an image to your desktop printer or sending it
to a prepress facility, knowing a few basics about printing makes
the print job go more smoothly and helps ensure that the finished
image appears as&#160;intended. Adobe® Photoshop® CS4 supports
printing documents greater than 30,000 pixels, and (Mac OS only)
can send 16-bit per channel data to printers.</p>
<dl><dt class="dlterm">Types of printing</dt>
<dd>For many Photoshop
users, printing a file means sending the image to an inkjet printer.
Photoshop can send your image to a variety of devices to be printed
directly onto paper or converted to a positive or negative image
on film. In the latter case, you can use the film to create a master
plate for printing by a mechanical press.</dd><p class="dlseparator"></p><dt class="dlterm">Types of images</dt>
<dd>The simplest images, such as line art, use
only one color in one level of gray. A more complex image, such
as a photograph, has varying color tones. This type of image is
known as a <dfn class="term">continuous-tone image</dfn>.</dd><p class="dlseparator"></p><dt class="dlterm">Halftoning</dt>
<dd>To create the illusion of continuous tones in images, printers
break down images into dots. For photos printed on a printing press,
this process is called <dfn class="term">halftoning</dfn>. Varying the sizes
of the dots in a halftone screen creates the optical illusion of
variations of gray or continuous color in the image.<div class="note"><span class="notetitle">Note:  </span>Although
inkjet printers also use dots to create the illusion of continuous
tones, their dots are of uniform size and much smaller than the
dots used by most printing presses.</div>
</dd><p class="dlseparator"></p><dt class="dlterm">Color separation</dt>
<dd>Artwork intended for commercial
reproduction and containing more than one color must be printed
on separate master plates, one for each color. This process, called <dfn class="term">color
separation</dfn>, generally calls for the use of cyan, yellow,
magenta, and black (CMYK) inks. In Photoshop, you can adjust how the
various plates are generated. </dd><p class="dlseparator"></p><dt class="dlterm">Quality of detail</dt>
<dd>The detail in a printed image depends on its resolution and screen
frequency. The higher the resolution of an output device, the finer (higher)
a screen ruling (lines per inch) you can use. Many inkjet printer
drivers offer simplified print settings for higher quality printing.</dd><p class="dlseparator"></p></dl>
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