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diff --git a/www/command-line-options.html b/www/command-line-options.html
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--- a/www/command-line-options.html
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 <p class="lead magick-description">Below is list of command-line options recognized by the ImageMagick <a href="command-line-tools.html">command-line tools</a>. If you want a description of a particular option, click on the option name in the navigation bar above and you will go right to it. Unless otherwise noted, each option is recognized by the commands: <a href="convert.html">convert</a> and <a href="mogrify.html">mogrify</a>.</p>
 
 <div style="margin: auto;">
@@ -938,7 +937,41 @@
 the operator to apply the operation using alpha channels. The <a
 href="command-line-options.html#clut">-clut</a> operator is a good example of this. </p>
 
+<div style="margin: auto;">
+  <h3 class="magick-header"><a id="channel-fx"></a>-channel-fx <var>expression</var></h3>
+</div>
 
+<p class="magick-description">exchange, extract, or copy one or more image channels.</p>
+
+<p>The expression consists of one or more channels, either mnemonic or numeric (e.g. red or 0, green or 1, etc.), separated by certain operation symbols as follows:</p>
+
+<pre>
+&lt;=&gt;  exchange two channels (e.g. red&lt;=&gt;blue)
+=&gt;   copy one channel to another channel (e.g. red=&gt;green)
+=    assign a constant value to a channel (e.g. red=50%)
+,    write new image with channels in the specified order (e.g. red, green)
+;    add a new output image for the next set of channel operations (e.g. red; green; blue)
+|    move to the next input image for the source of channel data (e.g. | gray=>alpha)
+</pre>
+
+<p>For example, to create 3 grayscale images from the red, green, and blue channels of an image, use:</p>
+
+<pre>
+-channel-fx "red; green; blue"
+</pre>
+
+<p>A channel without an operation symbol implies separate (i.e, semicolon).</p>
+
+<p>Here we take an sRGB image and a grayscale image and inject the grayscale image into the alpha channel:</p>
+<pre>
+convert wizard.png mask.pgm -channel-fx '| gray=>alpha' wizard-alpha.png
+</pre>
+<p>Use a similar command to define a read mask:</p>
+<pre>
+convert wizard.png mask.pgm -channel-fx '| gray=>read-mask' wizard-mask.png
+</pre>
+
+<p>Add <code>-debug pixel</code> prior to the <code>-channel-fx</code> option to track the channel morphology.</p>
 
 <div style="margin: auto;">
   <h3 class="magick-header"><a id="charcoal"></a>-charcoal <var>factor</var></h3>
@@ -946,6 +979,7 @@
 
 <p class="magick-description">Simulate a charcoal drawing.</p>
 
+
 <div style="margin: auto;">
   <h3 class="magick-header"><a id="chop"></a>-chop <var>geometry</var></h3>
 </div>
@@ -1200,7 +1234,7 @@
 OHTA         Rec601YCbCr  Rec709YCbCr  RGB
 scRGB        sRGB         Transparent  xyY
 XYZ          YCbCr        YCC          YDbDr
-YIQ          YPbPr        YUV
+YIQ          YPbPr        YUV          Undefined
 </pre>
 
 <p>To print a complete list of colorspaces, use <a href="command-line-options.html#list">-list colorspace</a>.</p>
@@ -1306,6 +1340,8 @@
 
 <p>Note the scRGB colorspace requires HDRI support otherwise it behaves just like linear RGB.</p>
 
+<p>Use the <code>Undefined</code> colorspace to identify multi-spectral images.</p>
+
 <div style="margin: auto;">
   <h3 class="magick-header"><a id="combine"></a>-combine</h3>
 </div>
@@ -1774,10 +1810,10 @@
 
   <tr>
     <td>colorspace:auto-grayscale=<var>on|off</var></td>
-    <td>prevent automatic conversion to grayscale inside coders that support 
-    grayscale. This should be accompanied by -type truecolor. PNG and TIF do 
-    not need this define. With PNG, just use PNG24:image. With TIF, just use 
-    -type truecolor. JPG and PSD will need this define.</td> 
+    <td>prevent automatic conversion to grayscale inside coders that support
+    grayscale. This should be accompanied by -type truecolor. PNG and TIF do
+    not need this define. With PNG, just use PNG24:image. With TIF, just use
+    -type truecolor. JPG and PSD will need this define.</td>
   </tr>
 
   <tr>
@@ -1794,9 +1830,9 @@
 
   <tr>
     <td>compose:clamp=<var>on|off</var></td>
-    <td>set each pixel whose value is below zero to zero and any the pixel 
-    whose value is above the quantum range to the quantum range (e.g. 65535) 
-    otherwise the pixel value remains unchanged.  Define supported in 
+    <td>set each pixel whose value is below zero to zero and any the pixel
+    whose value is above the quantum range to the quantum range (e.g. 65535)
+    otherwise the pixel value remains unchanged.  Define supported in
     ImageMagick 6.9.1-3 and above.</td>
   </tr>
 
@@ -8034,4 +8070,4 @@
 </div>
 </body>
 </html>
-<!-- Magick Cache 21st January 2017 12:16 -->
\ No newline at end of file
+<!-- Magick Cache 13th February 2017 11:33 -->
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