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     <a href="WSfd1234e1c4b69f30ea53e41001031ab64-7945a.html"><b>Image size and resolution</b></a> 
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                <h1>
                    About pixel dimensions and resolution
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                <br clear="both" /><div id="minitoc"><div class="t"><div class="b"><div class="l"><div class="r"><div class="bl"><div class="br"><div class="tl"><div class="tr"><div><h3>Contents [<a href="#" onclick="return toggleMiniToc('minitoc-links', this);" class="hideLink">Hide</a>]</h3><ul id="minitoc-links"><li><p><a href="#WSfd1234e1c4b69f30ea53e41001031ab64-793da"><h1 class="topictitle1">Display the current image size quickly</h1>
</a></p></li></ul></div></div><br clear="both" /></div></div></div></div></div></div></div></div><br clear="both" /><div><p>The pixel dimensions (image size or height
and width) of a bitmap image is a measure of the number of pixels
along an image’s width and height. Resolution is the fineness of
detail in a bitmap image and is measured in pixels per inch (ppi). The
more pixels per inch, the greater the resolution. Generally, an
image with a higher resolution produces a better printed image quality. </p>
<div class="fignone"><img alt="" id="im_04" src="images/im_04.png" /><div class="figdesc">Same image at 72‑ppi and 300‑ppi; inset zoom 200%</div><br /></div><p>The combination of pixel dimension and resolution determine the
amount of image data. Unless an image is <dfn class="term">resampled</dfn>,
the amount of image data remains the same as you change either the
pixel dimension or resolution. If you change the resolution of a
file, its width and height change accordingly to maintain the same amount
of image data. And, vice versa. For more information, see <a href="WSfd1234e1c4b69f30ea53e41001031ab64-793ca.html">Resampling</a>.</p>
<p>In Photoshop, you can see the relationship between image size
and resolution in the Image Size dialog box (choose Image&#160;&gt;
Image Size). Deselect Resample Image, because you don’t want to
change the amount of image data in your photo. Then change the width
or the height or the resolution. As you change one value, the other
two values change accordingly.</p>
<div class="fignone"><img alt="" id="im_03" src="images/im_03.png" /><div class="figdesc">Pixel dimensions equal document (output) size times resolution.</div><br /><dl><dt class="dlterm">A.</dt>
<dd>Original dimensions and resolution</dd><p class="dlseparator"></p><dt class="dlterm">B.</dt>
<dd>Decreasing
the resolution without changing pixel dimensions (no resampling)</dd><p class="dlseparator"></p><dt class="dlterm">C.</dt>
<dd>Decreasing
the resolution at same document size decreases pixel dimensions
(resampling).</dd><p class="dlseparator"></p></dl>
</div></div>
<div id="WSfd1234e1c4b69f30ea53e41001031ab64-793da" class="nochunk"><a name="WSfd1234e1c4b69f30ea53e41001031ab64-793da"></a><h3 class="topictitle3">Display the current image size quickly</h3><div><div class="section"><p>If you want to quickly display a document’s
current image size, use the information box at the bottom of the
document window. </p>
</div>
<div class="p"><span><img src="images/dingbat.png" />&#160;Position the pointer over the file information
box, and hold down the mouse button. </span></div>
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