Added image tagging section

docs/doxygen-user/tagging.dox

@@ -1,6 +1,6 @@
 /*! \page tagging_page Tagging
 
-Tagging (or Bookmarking) allows you to create a reference to a file or object and easily find it later. Tagging is also used by the \ref central_repo_page "central repository" to mark items as notable.
+Tagging (or Bookmarking) allows you to create a reference to a file or object and easily find it later or include in a \ref reporting_page "report". For images, you can select a portion of the image to tag. Tagging is also used by the \ref central_repo_page "central repository" to mark items as notable.
 
 \section tagging_items Tagging items
 
@@ -41,6 +41,40 @@ Tagged results are shown in the "Results" portion of the tree under "Tags". Tagg
 
 \image html tagging-4.PNG
 
+\section image_tagging Image tagging
+
+When you have an image selected in the \ref result_viewer_page, you'll see a "Tags Menu" option in the upper right of the "Application" \ref content_viewer_page "Content Viewer". This allows you to tag only a selected area of the image.
+
+\image html tagging_image_menu.png
+
+\subsection image_tagging_creation Creating and editing an image tag
+
+To start, select the "Create" option on the tags menu. Then left-click and hold to draw a box around part of the image. When you release the mouse, you'll be able to choose which tag name to use.
+
+\image html tagging_image_select.png
+
+You can add a new tag name using the "New Tag" button.
+
+\image html tagging_image_create_tag.png
+
+Once you choose the tag name you'll see a red outline in the image around the section you chose. If you need to edit the tag, right click on the red border to select it. From here you can drag the edges to resize the box, or delete it by selecting "Delete" from the tags menu.
+
+\image html tagging_image_edit_tag.png
+
+You can create multiple tags in the same image.
+
+\image html tagging_image_multiple.png
+
+If you want to temporarily hide the tag outlines, select "Hide" from the tags menu. You can then select "Show" to see them again. The outlines will also reappear if you switch to a different item in the Result Viewer and come back.
+
+\subsection image_tagging_report Exporting and reporting on image tags
+
+If you want to save the image with the tag outline, select "Export" from the tags menu. The result will always be a PNG file. Note that using the "Extract File(s)" option from the right-click menu in the Result Viewer will export the original image.
+
+You'll also be able to see the image tags in an \ref report_html "HTML report".
+
+\image html tagging_images_report.png
+
 \section managing_tags Managing tags
 
 The list of tags can be edited through the Tags tab on the Options menu.