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+<html>
+<head>
+   <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+   <meta name="Author" content="Oliver Rauch">
+   <meta name="Description" content="scan, photocopy and fax frontend for SANE">
+   <title>XSane - Enhancement setup</title>
+</head>
+<body text="#000000" bgcolor="#FFFFFF" link="#0000EF" vlink="#51188E" alink="#FF0000">
+
+
+<table>
+<tr>
+<td width=200>
+<img SRC="xsane-logo2.jpg" alt="XSane-logo" hspace=30 align=TOP>
+</td>
+<td>
+<blockquote>
+<h1><font color="#009900">Enhancement setup</font></h1>
+</blockquote>
+</td>
+</tr>
+</table>
+
+
+<hr WIDTH="100%">
+
+<table>
+<tr>
+<td valign=TOP width="200" bgcolor="#E0E0BA">
+<br>
+<a href="sane-xsane-doc.html">Index</a>
+<br>
+<br>
+<br>
+<font color="#000000">Main window:</font>
+<ul>
+<li><a href="sane-xsane-viewer-doc.html">Viewer mode</a></li>
+<li><a href="sane-xsane-save-doc.html">Save mode</a></li>
+<li><a href="sane-xsane-copy-doc.html">Copy mode</a></li>
+<li><a href="sane-xsane-fax-doc.html">Fax mode</a></li>
+<li><a href="sane-xsane-mail-doc.html">Mail mode</a></li>
+<li><a href="sane-xsane-gimp-doc.html">Gimp plugin</a></li>
+</ul>
+<br>
+<a href="sane-xsane-color-correction-doc.html">Color correction:</a>
+<ul>
+<li><a href="sane-xsane-color-correction-doc.html#GAMMA">Gamma correction</a></li>
+<li><a href="sane-xsane-color-correction-doc.html#BRIGHTNESS">Brightness</a></li>
+<li><a href="sane-xsane-color-correction-doc.html#CONTRAST">Contrast</a></li>
+<li><a href="sane-xsane-color-correction-doc.html#THRESHOLD">Threshold</a></li>
+<li><a href="sane-xsane-color-correction-doc.html#RGB_DEFAULT">RGB default</a></li>
+<li><a href="sane-xsane-color-correction-doc.html#NEGATIVE">Negative</a></li>
+<li><a href="sane-xsane-color-correction-doc.html#AUTOENHANCEMENT">Autoenhancement</a></li>
+<li><a href="sane-xsane-color-correction-doc.html#ENHANCEMENT_DEFAULT">Default</a></li>
+<li><a href="sane-xsane-color-correction-doc.html#RESTORE_ENHANCEMENT">Restore</a></li>
+<li><a href="sane-xsane-color-correction-doc.html#STORE_ENHANCEMENT">Store</a></li>
+<li><a href="sane-xsane-histogram-doc.html">Histogram window</a></li>
+<li><a href="sane-xsane-preview-doc.html#PIPETTE_WHITE">Pipette functions</a></li>
+</ul>
+<br>
+<a href="sane-xsane-standard-doc.html">Standard options window</a>
+<br>
+<br>
+<br>
+<a href="sane-xsane-advanced-doc.html">Advanced options window</a>
+<br>
+<br>
+<br>
+<a href="sane-xsane-preview-doc.html">Preview:</a>
+<ul>
+<li><a href="sane-xsane-preview-doc.html#PIPETTE_WHITE">Pipette white</a></li>
+<li><a href="sane-xsane-preview-doc.html#PIPETTE_GRAY">Pipette gray</a></li>
+<li><a href="sane-xsane-preview-doc.html#PIPETTE_BLACK">Pipette black</a></li>
+<li><a href="sane-xsane-preview-doc.html#UNZOOM">Unzoom</a></li>
+<li><a href="sane-xsane-preview-doc.html#ZOOM_OUT">Zoom out</a></li>
+<li><a href="sane-xsane-preview-doc.html#ZOOM_IN">Zoom in</a></li>
+<li><a href="sane-xsane-preview-doc.html#UNDO_ZOOM">Undo zoom</a></li>
+<li><a href="sane-xsane-preview-doc.html#AUTOSELECT">Autoselect scanarea</a></li>
+<li><a href="sane-xsane-preview-doc.html#SELECT_VISIBLE_AREA">Select visible area</a></li>
+<li><a href="sane-xsane-preview-doc.html#SELECT_SCAN_AREA">Select scanarea</a></li>
+<li><a href="sane-xsane-preview-doc.html#MOVE_SCAN_AREA">Move scanarea</a></li>
+<li><a href="sane-xsane-preview-doc.html#DELETE_PREVIEW_CACHE">Delete preview cache</a></li>
+</ul>
+<br>
+<font color="#000000">Setup:</font>
+<ul>
+<li><a href="sane-xsane-setup-copy-doc.html">Copy setup</a></li>
+<li><a href="sane-xsane-setup-display-doc.html">Display setup</a></li>
+<li><a href="sane-xsane-setup-enhancement-doc.html">Enhancement setup</a></li>
+<li><a href="sane-xsane-setup-fax-doc.html">Fax setup</a></li>
+<li><a href="sane-xsane-setup-image-doc.html">Image setup</a></li>
+<li><a href="sane-xsane-setup-mail-doc.html">Mail setup</a></li>
+<li><a href="sane-xsane-setup-save-doc.html">Saving setup</a></li>
+</ul>
+</td>
+
+
+
+<td VALIGN=TOP BGCOLOR="#FFFFFF">
+<blockquote>
+<br>
+You open the setup window via the menu <i>preferences/setup</i> in the
+main window of xsane.
+<br>
+<br>   
+<br>
+<center><img SRC="xsane-setup-enhancement.jpg" alt="XSane-setup-enhancement-window"></center>
+<br>
+<br>
+<h4>THRESHOLD OPTION:</h4>
+<blockquote>
+There are three options available:
+<ul>
+<li><b>Standard options window (lineart)</b></li>
+</ul>
+<blockquote>
+The threshold option is kept untouched. If the backend makes
+available a "threshold" option you find it in the standard or advanced
+options window. You have to do a new preview scan to see changes of the
+threshold value.
+</blockquote>
+
+<ul>
+<li><b>XSane main window (lineart)</b></li>
+</ul>
+<blockquote>
+If the backend makes available a "threshold" option it is moved
+to the main window. The value range is normalized (see
+<i>THRESHOLD MINIMUM, MAXIMUM, MULTIPLIER, OFFSET</i>).
+You have to do a new preview scan to see changes of the threshold value.
+</blockquote>
+
+<ul>
+<li><b>XSane main window (grayscale->lineart)</b></li>
+</ul>
+<blockquote>
+If the backend makes available a "threshold" option it is moved
+to the main window. The preview scan is done in grayscale mode (see
+<i>NAME OF GRAYSCALE SCANMODE</i>) and transformed to black/white. Changes
+of the threshold value are visible in the preview window without a new preview
+scan. The value range of the threshold option is normalized (see
+<i>THRESHOLD MINIMUM, MAXIMUM, MULTIPLIER, OFFSET</i>).
+</blockquote>
+</blockquote>
+</blockquote>
+
+<h4>THRESHOLD MINIMUM, MAXIMUM, MULTIPLIER, OFFSET:</h4>
+<blockquote>
+These values are used to make the threshold function of the
+backends work the same way XSane does handle it. This is:
+<b>the threshold value defines the brightness level in % that is needed
+to get a white point.  A value of 0% creates a totally white image, a value
+of 100% creates a totally black image.</b>
+<br>
+If the threshold function of the backend does not cover the full range
+(0-100% = white...black), you can reduce the range with the values MINIMUM
+and MAXIMUM. If the backend defines another value range (e.g 0-255 ) you
+have to enter a MULTIPLIER (2.55 for rang 0-255), with the OFFSET value
+you can shift the range linear.
+<br>
+<br>
+<b>The calculation is:</b>
+<blockquote>
+<b>backend_threshold = OFFSET + MULTIPLIER * xsane_threshold</b>
+</blockquote>
+<b>where the user can select xsane_threshold in the range from MINIMUM to MAXIMUM.</b>
+</blockquote>
+
+<h4>NAME OF GRAYSCALE SCANMODE:</h4>
+<blockquote>
+If you want to do a grayscale previewscan when lineart scanmode
+is selected, you have to tell xsane the name of the grayscale mode. This
+is because the scanmode is defined by the backend and differen backends
+may use different names. You have to enter the original name (not translated)
+case sensitive (take a look at the scanmode selection menu in the xsane
+main window).
+<br>
+The name should be something like
+<blockquote>
+<b><i>Gray</i></b>
+</blockquote>
+
+</blockquote>
+</td>
+</tr>
+</table>
+
+<hr WIDTH="100%">
+
+<blockquote>
+Author: <a href="mailto:Oliver.Rauch@xsane.org">Oliver Rauch</a>
+</blockquote>
+
+</body>
+</html>