1) Converted all images to JPG to reduce size.

2) Added a raw Latex page break directive after each TOC tree. (For the PDF tutorial look).
3) Two finished tutorials: 
   a) one describing how the Mat data structure works and its output capabilities (format function) (demonstration YouTube video included).
   b) one describing image scanning operations plus the LUT function (demonstration YouTube video included). 
   c) a basic filtering approach (plus multi row image scanning demonstration) in the work.

doc/tutorials/introduction/table_of_content_introduction/table_of_content_introduction.rst

@@ -41,7 +41,7 @@ Here you can read tutorials about how to set up your computer to work with the O
 
   =========== ======================================================
 
-  .. |Usage_1| image:: images/gccegg-65.png
+  .. |Usage_1| image:: images/gccegg-65.jpg
                :height: 90pt
                :width:  90pt
 
@@ -137,7 +137,7 @@ Here you can read tutorials about how to set up your computer to work with the O
 
   ============= ======================================================
 
-  .. |Beginners_1| image:: images/Display_Image_Tutorial_Result.png
+  .. |Beginners_1| image:: images/Display_Image_Tutorial_Result.jpg
                    :height: 90pt
                    :width:  90pt
 
@@ -155,10 +155,14 @@ Here you can read tutorials about how to set up your computer to work with the O
 
   =============== ======================================================
 
-  .. |Beginners_2| image:: images/Load_Save_Image_Result_1.png
+  .. |Beginners_2| image:: images/Load_Save_Image_Result_1.jpg
                    :height: 90pt
                    :width:  90pt
 
+.. raw:: latex
+
+   \pagebreak
+
 .. We use a custom table of content format and as the table of content only imforms Sphinx about the hierarchy of the files, no need to show it.
 .. toctree::
    :hidden: