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     <a href="WSfd1234e1c4b69f30ea53e41001031ab64-7945a.html"><b>Image size and resolution</b></a> 
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                <h1>
                    Change the print dimensions and resolution
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                <div><div class="section"><p>When
creating an image for print media, it’s useful to specify image
size in terms of the printed dimensions and the image resolution.
These two measurements, referred to as the <dfn class="term">document size</dfn>,
determine the total pixel count and therefore the&#160;file
size of the image; document size also determines&#160;the base
size at which an image is placed into another application. You can
further manipulate the scale of the printed image using the Print
command; however, changes you make using the Print command affect
only the printed image, not the document size of the image file.</p>
<p>If
you turn on resampling for the image, you can change print dimensions
and resolution independently (and change the total number of pixels
in the image). If you turn off resampling, you can change either
the dimensions or the resolution—Photoshop adjusts the other value
automatically to preserve the total pixel count. For the highest
print quality, it’s generally best to change the dimensions and
resolution first, without resampling. Then resample only as necessary.</p>
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<ol><li class="stepexpand"><span>Choose Image&#160;&gt; Image Size.</span></li>
<li class="stepexpand"><span>Change the print dimensions, image resolution, or both:</span><ul><li><p>To change only the print dimensions or
only the resolution and adjust the total number of pixels in the
image proportionately, select Resample Image and then choose an
interpolation method. </p>
</li>
<li><p>To change the print dimensions and resolution without
changing the total number of pixels in the image, deselect Resample
Image.</p>
</li>
</ul>
</li>
<li class="stepexpand"><span>To maintain the current ratio of image width to image
height, select Constrain Proportions. This option automatically
changes the width as you change the height, and vice versa.</span></li>
<li class="stepexpand"><span>Under Document Size, enter new values for the height
and width. If desired, choose a new unit of measurement. Note that
for Width, the Columns option uses the width and gutter sizes specified
in the Units &amp; Rulers preferences.</span></li>
<li class="stepexpand"><span>For Resolution, enter a new value. If desired, choose
a new unit of measurement.</span> <div class="tip"><img src="images/tip_help.png" />To restore the initial values displayed
in the Image Size dialog box, hold down Alt (Windows) or Option
(Mac&#160;OS), and click&#160;Reset.</div></li>
</ol>
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