sigmoidalcontrastimage.xml Amend parameter names

reference/imagick/imagick/sigmoidalcontrastimage.xml

@@ -15,19 +15,21 @@
    <methodparam><type>float</type><parameter>beta</parameter></methodparam>
    <methodparam choice="opt"><type>int</type><parameter>channel</parameter><initializer>Imagick::CHANNEL_DEFAULT</initializer></methodparam>
   </methodsynopsis>
-  <para>
+  <simpara>
    Adjusts the contrast of an image with a non-linear sigmoidal contrast
    algorithm. Increase the contrast of the image using a sigmoidal transfer
-   function without saturating highlights or shadows. Contrast indicates
-   how much to increase the contrast (0 is none; 3 is typical; 20 is
-   pushing it); mid-point indicates where midtones fall in the resultant
-   image (0 is white; 50 is middle-gray; 100 is black). Set sharpen to
+   function without saturating highlights or shadows. <parameter>alpha</parameter> indicates
+   how much to increase the contrast: <literal>0.00</literal> is none; <literal>3.00</literal> is
+   typical; <literal>20.00</literal> is pushing it.
+   <parameter>beta</parameter> indicates where midtones fall in the resultant
+   image: <literal>0.00</literal> is white; <literal>0.50</literal> is
+   middle-gray; <literal>1.00</literal> is black. Set <parameter>sharpen</parameter> to
    &true; to increase the image contrast otherwise the contrast is reduced.
-  </para>
-  <para>
+  </simpara>
+  <simpara>
    See also <link xlink:href="&url.imagemagick.usage.color_mods.sigmoidal;">ImageMagick
-   v6 Examples - Image Transformations — Sigmoidal Non-linearity Contrast</link>
-  </para>
+    Examples -- Color Modifications — Sigmoidal Non-linearity Contrast</link>.
+  </simpara>
  </refsect1>
 
  <refsect1 role="parameters">
@@ -37,33 +39,35 @@
     <varlistentry>
      <term><parameter>sharpen</parameter></term>
      <listitem>
-      <para>
-       If true increase the contrast, if false decrease the contrast.
-      </para>
+      <simpara>
+       If &true; increase the contrast, if &false; decrease the contrast.
+      </simpara>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><parameter>alpha</parameter></term>
      <listitem>
-      <para>
-       The amount of contrast to apply. 1 is very little, 5 is a significant amount, 20 is extreme.
-      </para>
+      <simpara>
+       The amount of contrast to apply. <literal>1.00</literal> is very little, <literal>5.00</literal>
+       is a significant amount, <literal>20.00</literal> is extreme.
+      </simpara>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><parameter>beta</parameter></term>
      <listitem>
       <simpara>
-       Where the midpoint of the gradient will be. This value should be in the range 0 to 1 - multiplied by the quantum value for ImageMagick.
+       Where the midpoint of the gradient will be. This value should be in the range <literal>0.00</literal>
+       to <literal>1.00</literal> - multiplied by the quantum value for ImageMagick.
       </simpara>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><parameter>channel</parameter></term>
      <listitem>
-      <para>
+      <simpara>
        Which color channels the contrast will be applied to.
-      </para>
+      </simpara>
      </listitem>
     </varlistentry>
    </variablelist>
@@ -86,31 +90,28 @@
 
  <refsect1 role="examples">
   &reftitle.examples;
-  <para>
-   <example>
-    <title>
-     Create a gradient image using <function>Imagick::sigmoidalContrastImage</function>
-     suitable for blending two images together smoothly, with the blending
-     defined by $contrast and $the midpoint
-    </title>
-    <programlisting role="php">
+  <example>
+   <title>
+    Create a gradient image using <function>Imagick::sigmoidalContrastImage</function>
+    suitable for blending two images together smoothly, with the blending
+    defined by <parameter>alpha</parameter> and <parameter>beta</parameter>
+   </title>
+   <programlisting role="php">
 <![CDATA[
 <?php
 
-function generateBlendImage($width, $height, $contrast = 10, $midpoint = 0.5) {
+function generateBlendImage($width, $height, $alpha = 10, $beta = 0.5)
+{
     $imagick = new Imagick();
     $imagick->newPseudoImage($width, $height, 'gradient:black-white');
     $quanta = $imagick->getQuantumRange();
-    $imagick->sigmoidalContrastImage(true, $contrast, $midpoint * $quanta["quantumRangeLong"]);
+    $imagick->sigmoidalContrastImage(true, $alpha, $beta * $quanta["quantumRangeLong"]);
 
     return $imagick; 
 }
-
-?>
 ]]>
-    </programlisting>
-   </example>
-  </para>
+   </programlisting>
+  </example>
  </refsect1>
 
 </refentry>