diff --git a/reference/image/functions/getimagesize.xml b/reference/image/functions/getimagesize.xml
index 3d38ef3c6d..cc8e6ba68e 100644
--- a/reference/image/functions/getimagesize.xml
+++ b/reference/image/functions/getimagesize.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.28 $ -->
+<!-- $Revision: 1.29 $ -->
 <refentry id="function.getimagesize">
  <refnamediv>
   <refname>getimagesize</refname>
@@ -127,7 +127,7 @@ if ($size && $fp) {
   <para>
    If accessing the <parameter>filename</parameter> image is impossible, or
    if it isn't a valid picture, <function>getimagesize</function> will
-   generate an error of level <varname>E_WARNING</varname>.
+   generate an error of level <constant>E_WARNING</constant>.
   </para>
  </refsect1>
  <refsect1 role="changelog">
diff --git a/reference/image/functions/imagefilter.xml b/reference/image/functions/imagefilter.xml
index d064b6ed66..65ca5da2c1 100644
--- a/reference/image/functions/imagefilter.xml
+++ b/reference/image/functions/imagefilter.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='iso-8859-1'?>
-<!-- $Revision: 1.7 $ -->
+<!-- $Revision: 1.8 $ -->
 <refentry id="function.imagefilter">
  <refnamediv>
   <refname>imagefilter</refname>
@@ -33,34 +33,34 @@
        <itemizedlist>
         <listitem>
          <simpara>
-          <parameter>IMG_FILTER_NEGATE</parameter>: Reverses all colors of
+          <constant>IMG_FILTER_NEGATE</constant>: Reverses all colors of
           the image.
          </simpara>
         </listitem>
         <listitem>
          <simpara>
-          <parameter>IMG_FILTER_GRAYSCALE</parameter>: Converts the image into
+          <constant>IMG_FILTER_GRAYSCALE</constant>: Converts the image into
           grayscale.
          </simpara>
         </listitem>
         <listitem>
          <simpara>
-          <parameter>IMG_FILTER_BRIGHTNESS</parameter>: Changes the brightness
+          <constant>IMG_FILTER_BRIGHTNESS</constant>: Changes the brightness
           of the image. Use <parameter>arg1</parameter> to set the level of
           brightness.
          </simpara>
         </listitem>
         <listitem>
          <simpara>
-          <parameter>IMG_FILTER_CONTRAST</parameter>: Changes the contrast of
+          <constant>IMG_FILTER_CONTRAST</constant>: Changes the contrast of
           the image. Use <parameter>arg1</parameter> to set the level of
           contrast.
          </simpara>
         </listitem>
         <listitem>
          <simpara>
-          <parameter>IMG_FILTER_COLORIZE</parameter>: Like
-          <parameter>IMG_FILTER_GRAYSCALE</parameter>, except you can specify the
+          <constant>IMG_FILTER_COLORIZE</constant>: Like
+          <constant>IMG_FILTER_GRAYSCALE</constant>, except you can specify the
           color. Use <parameter>arg1</parameter>, <parameter>arg2</parameter> and
           <parameter>arg3</parameter> in the form of
           <parameter>red</parameter>, <parameter>blue</parameter>,
@@ -69,35 +69,35 @@
         </listitem>
         <listitem>
          <simpara>
-          <parameter>IMG_FILTER_EDGEDETECT</parameter>: Uses edge detection to
+          <constant>IMG_FILTER_EDGEDETECT</constant>: Uses edge detection to
           highlight the edges in the image.
          </simpara>
         </listitem>
         <listitem>
          <simpara>
-          <parameter>IMG_FILTER_EMBOSS</parameter>: Embosses the image.
+          <constant>IMG_FILTER_EMBOSS</constant>: Embosses the image.
          </simpara>
         </listitem>
         <listitem>
          <simpara>
-          <parameter>IMG_FILTER_GAUSSIAN_BLUR</parameter>: Blurs the image using
+          <constant>IMG_FILTER_GAUSSIAN_BLUR</constant>: Blurs the image using
           the Gaussian method.
          </simpara>
         </listitem>
         <listitem>
          <simpara>
-          <parameter>IMG_FILTER_SELECTIVE_BLUR</parameter>: Blurs the image.
+          <constant>IMG_FILTER_SELECTIVE_BLUR</constant>: Blurs the image.
          </simpara>
         </listitem>
         <listitem>
          <simpara>
-          <parameter>IMG_FILTER_MEAN_REMOVAL</parameter>: Uses mean removal to
+          <constant>IMG_FILTER_MEAN_REMOVAL</constant>: Uses mean removal to
           achieve a "sketchy" effect.
          </simpara>
         </listitem>
         <listitem>
          <simpara>
-          <parameter>IMG_FILTER_SMOOTH</parameter>: Makes the image smoother.
+          <constant>IMG_FILTER_SMOOTH</constant>: Makes the image smoother.
           Use <parameter>arg1</parameter> to set the level of smoothness.
          </simpara>
         </listitem>