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/highgui/trackbar/trackbar.rst

@@ -7,7 +7,7 @@ Adding a Trackbar to our applications!
 
 * Well, it is time to use some fancy GUI tools. OpenCV provides some GUI utilities (*highgui.h*) for you. An example of this is a **Trackbar** 
 
-  .. image:: images/Adding_Trackbars_Tutorial_Trackbar.png
+  .. image:: images/Adding_Trackbars_Tutorial_Trackbar.jpg
      :alt: Trackbar example
      :align: center 
 
@@ -145,13 +145,13 @@ Result
 
 * Our program produces the following output:
 
-  .. image:: images/Adding_Trackbars_Tutorial_Result_0.png
+  .. image:: images/Adding_Trackbars_Tutorial_Result_0.jpg
      :alt: Adding Trackbars - Windows Linux
      :align: center 
 
 * As a manner of practice, you can also add 02 trackbars for the program made in :ref:`Basic_Linear_Transform`. One trackbar to set :math:`\alpha` and another for :math:`\beta`. The output might look like:
 
-  .. image:: images/Adding_Trackbars_Tutorial_Result_1.png
+  .. image:: images/Adding_Trackbars_Tutorial_Result_1.jpg
      :alt: Adding Trackbars - Lena
      :height: 500px
      :align: center