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<ul class="navigation"><li class="prev"><a accesskey="p" class="prev" href="WS75D24624-A761-40b6-832E-8AB0E2383C90a.html" title="About pixel dimensions and resolution"><img src="images/blank.gif" alt="Previous" width="17" height="17" /></a></li><li class="next"><a accesskey="n" class="next" href="WS6A981807-742F-4d7b-A56C-A000DCD26707a.html" title="About monitor resolution"><img src="images/blank.gif" alt="Next" width="17" height="17" /></a></li></ul><div class="hierarchy" id="hierarchy"><a href="WSfd1234e1c4b69f30ea53e41001031ab64-794aa.html">Opening and importing images</a> /
     <a href="WSfd1234e1c4b69f30ea53e41001031ab64-7945a.html"><b>Image size and resolution</b></a> 
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                <h1>
                    File size
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                <div><p>The file size of an image is the digital
size of the image file, measured in kilobytes (K), megabytes (MB),
or gigabytes (GB). File size is proportional to the pixel dimensions
of the image. Images with more pixels may produce more detail at
a given printed size, but they require more disk space to store
and may be slower to edit and print. Image resolution thus becomes
a compromise between image quality (capturing all the data you need)
and file size. </p>
<p>Another factor that affects file size is file format. Because
of the varying compression methods used by GIF, JPEG, and PNG file
formats, file sizes can vary considerably for the same pixel dimensions.
Similarly, color bit-depth and the number of layers and channels
in an image affect file size. </p>
<p>Photoshop supports a maximum
pixel dimension of 300,000 by 300,000 pixels per image. This restriction
places limits on the print size and resolution available to an image.</p>
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