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<html>
<head>
<link rel="stylesheet" title="normal" type="text/css" href="fslview.css">
<title>Opening Images</title>
</head>
<body>
<h3>Opening Images</h3>
<p>FSLView can read <a name="analyze">Analyze</a> and <a name="nifti">NIFTI</a> files, either uncompressed or
compressed, and either as a single file (e.g., <i>image.nii.gz</i>) or
two files (e.g., <i>image.hdr</i> & <i>image.img</i>). To open an
image, select the <i>Open</i> option from the <i>File</i> menu. A file
opening dialog will appear. It will list all directories and all files
with a suitable extension. Select the image file that you want to load
and press the <i>Open</i> button.
<p> The image will then be opened in <i>Ortho</i> <a name="view">view</a>; coronal,
sagittal and axial views are displayed simultaneously. If there is
sufficient information present in the image header, <i>L, R, A, P, S,
I</i> (Left, Right, Anterior=front, Posterior=back,
Superior=top, Inferior=bottom) <a name="markers">orientation markers</a> will be displayed, making the
orientation clear. The image name will be displayed in the <a
href="imagelist.html">Image List</a>. Because this is the first image
to be loaded it will be the "<i>Main Image</i>"; in the
<i>Image List</i> it will be marked with a small set of arrows <img
src="mainimage.png">.
<p>To load a second image (an "<i>overlay</i>"), select <i>File ->
Add</i>. The image to be added must have the same dimensions as the
<i>Main Image</i>, otherwise a message will appear saying <i>Cannot
load incompatible overlay</i>.
<p>When the second overlay is added, its name will appear in the <a
href="imagelist.html">Image List</a>. Since it is not the
<i>Main Image</i> it will not be marked with arrows. The <i>Image
List</i> control can be used to change the transparency of images,
change the order in which they are drawn, make them visible or
invisible and lock or unlock them (for editing).
</body>
</html>
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