Mention digital camera meta data.

Clearify capabilities of image 'on first sight'


git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@93924 c90b9560-bf6c-de11-be94-00142212c4b1

reference/image/functions/exif-read-data.xml

@@ -1,11 +1,12 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.5 $ -->
+<!-- $Revision: 1.6 $ -->
 <!-- splitted from ./en/functions/image.xml, last change in rev 1.78 -->
   <refentry id="function.exif-read-data">
    <refnamediv>
     <refname>exif_read_data</refname>
     <refpurpose>Read the <acronym>EXIF</acronym> headers from <acronym>JPEG</acronym>
-    or <acronym>TIFF</acronym></refpurpose>
+    or <acronym>TIFF</acronym>. This way you can read meta data generated by digital
+    cameras.</refpurpose>
    </refnamediv>
    <refsect1>
     <title>Description</title>

reference/image/reference.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.4 $ -->
+<!-- $Revision: 1.5 $ -->
 <reference id="ref.image">
  <title>Image functions</title>
  <titleabbrev>Image</titleabbrev>
@@ -13,6 +13,13 @@
      <acronym>PNG</acronym>, <acronym>SWF</acronym>,
      <acronym>TIFF</acronym> and <acronym>JPEG2000</acronym> images.
     </para>
+    <para>
+     <note>
+      Read requirements section about how to expand image capabilities
+      to read, write and modify images and to read meta data of pictures
+      taken by digital cameras.
+     </note>
+    </para>
    </section>
 
    <section id="image.requirements">
@@ -29,12 +36,21 @@
      Versions of <acronym>GD</acronym> older than gd-1.6
      support gif format images, and do not support png, where versions
      greater than gd-1.6 support png, not gif.
+     <simpara>
+      <note>
+       Since PHP 4.3 there is a bundeled version of the GD lib. This bundeled
+       version has some additional features like alpha blending and should
+       be used in preference to the external library since it's codebase is
+       better maintained and more stable.
+      </note>
+     </simpara>
     </para>
     <para>
      If you have PHP compiled with <option role="configure">--enable-exif</option>
      you are able to work with information stored in headers of
-     <acronym>JPEG</acronym> and <acronym>TIFF</acronym> images. These
-     functions do not require the <acronym>GD</acronym> library.
+     <acronym>JPEG</acronym> and <acronym>TIFF</acronym> images. This way you can
+     read meta data generated by digital cameras as mentioned above. These
+     functions does not require the <acronym>GD</acronym> library.
     </para>
    </section>