Changed PDF images to PNG format.

docs/source/app_waveforms.rst

@@ -15,7 +15,7 @@ A Gaussian waveform.
 
 where :math:`I` is the current, :math:`\zeta = 2\pi^2f^2`, :math:`\chi=\frac{1}{f}` and :math:`f` is the frequency.
 
-.. figure:: images/gaussian.pdf
+.. figure:: images/gaussian.png
 
     Example of the ``gaussian`` waveform - time domain and power spectrum.
 
@@ -29,7 +29,7 @@ First derivative of a Gaussian waveform.
 
 where :math:`I` is the current, :math:`\zeta = 2\pi^2f^2`, :math:`\chi=\frac{1}{f}` and :math:`f` is the frequency.
 
-.. figure:: images/gaussiandot.pdf
+.. figure:: images/gaussiandot.png
 
     Example of the ``gaussiandot`` waveform - time domain and power spectrum.
 
@@ -43,7 +43,7 @@ Normalised first derivative of a Gaussian waveform.
 
 where :math:`I` is the current, :math:`\zeta = 2\pi^2f^2`, :math:`\chi=\frac{1}{f}` and :math:`f` is the frequency.
 
-.. figure:: images/gaussiandotnorm.pdf
+.. figure:: images/gaussiandotnorm.png
 
     Example of the ``gaussiandotnorm`` waveform - time domain and power spectrum.
 
@@ -57,7 +57,7 @@ Second derivative of a Gaussian waveform.
 
 where :math:`I` is the current, :math:`\zeta = 2\pi^2f^2`, :math:`\chi=\frac{1}{f}` and :math:`f` is the frequency.
 
-.. figure:: images/gaussiandotdot.pdf
+.. figure:: images/gaussiandotdot.png
 
     Example of the ``gaussiandotdot`` waveform - time domain and power spectrum.
 
@@ -71,7 +71,7 @@ Normalised second derivative of a Gaussian waveform.
 
 where :math:`I` is the current, :math:`\zeta = 2\pi^2f^2`, :math:`\chi=\frac{1}{f}` and :math:`f` is the frequency.
 
-.. figure:: images/gaussiandotdotnorm.pdf
+.. figure:: images/gaussiandotdotnorm.png
 
     Example of the ``gaussiandotdotnorm`` waveform - time domain and power spectrum.
 
@@ -85,7 +85,7 @@ Third derivative of a Gaussian waveform.
 
 where :math:`I` is the current, :math:`\zeta = 2\pi^2f^2`, :math:`\chi=\frac{1}{f}` and :math:`f` is the frequency.
 
-.. figure:: images/gaussiandotdotdot.pdf
+.. figure:: images/gaussiandotdotdot.png
 
     Example of the ``gaussiandotdotdot`` waveform - time domain and power spectrum.
 
@@ -99,7 +99,7 @@ A Ricker (or Mexican Hat) waveform which is the negative, normalised second deri
 
 where :math:`I` is the current, :math:`\zeta = 2\pi^2f^2`, :math:`\chi=\frac{1}{f}` and :math:`f` is the frequency.
 
-.. figure:: images/ricker.pdf
+.. figure:: images/ricker.png
 
     Example of the ``ricker`` waveform - time domain and power spectrum.
 
@@ -123,7 +123,7 @@ and
 
 :math:`I` is the current, :math:`t` is time and :math:`f` is the frequency.
 
-.. figure:: images/sine.pdf
+.. figure:: images/sine.png
 
     Example of the ``sine`` waveform - time domain and power spectrum.
 
@@ -147,7 +147,7 @@ and
 
 where :math:`I` is the current, :math:`R_c` is set to :math:`0.25`, :math:`t` is time and :math:`f` is the frequency.
 
-.. figure:: images/contsine.pdf
+.. figure:: images/contsine.png
 
     Example of the ``contsine`` waveform - time domain and power spectrum.
 

docs/source/examples_2D.rst

@@ -19,7 +19,7 @@ The geometry of the scenario is straightforward and is shown in :numref:`cylinde
 
 .. _cylinder_half_space_geo:
 
-.. figure:: images/cylinder_half_space_geo.pdf
+.. figure:: images/cylinder_half_space_geo.png
     :width: 600 px
 
     Geometry of a 2D model of a metal cylinder buried in a dielectric half-space.
@@ -123,7 +123,7 @@ You should have produced an output file ``cylinder_Ascan_2D.out``. You can view
 
 .. _cylinder_Ascan_results:
 
-.. figure:: images/cylinder_Ascan.pdf
+.. figure:: images/cylinder_Ascan.png
 
     Field outputs from a model of a metal cylinder buried in a dielectric half-space.
 
@@ -169,7 +169,7 @@ You can now view an image of the B-scan using the command:
 
 .. _cylinder_Bscan_results:
 
-.. figure:: images/cylinder_Bscan_results.pdf
+.. figure:: images/cylinder_Bscan_results.png
 
     B-scan of model of a metal cylinder buried in a dielectric half-space.
 

docs/source/examples_3D.rst

@@ -29,7 +29,7 @@ Results
 
 .. _antenna_MALA_1200_fs_results:
 
-.. figure:: images/antenna_MALA_1200_fs_results.pdf
+.. figure:: images/antenna_MALA_1200_fs_results.png
 
     Field outputs from the receiver bowtie of a model of an antenna similar to a MALA 1.2GHz antenna.
 
@@ -64,7 +64,7 @@ Results
 
 .. _GSSI_1500_cylinder_Bscan_results:
 
-.. figure:: images/GSSI_1500_cylinder_Bscan_results.pdf
+.. figure:: images/GSSI_1500_cylinder_Bscan_results.png
 
     B-scan of model of a metal cylinder buried in a dielectric half-space with a model of an antenna similar to a GSSI 1.5GHz antenna.
 

docs/source/gprmodelling.rst

@@ -27,7 +27,7 @@ temporal :math:`\Delta t` steps play a very significant role -- since the smalle
 
 .. _yeecell:
 
-.. figure:: images/yeecell.pdf
+.. figure:: images/yeecell.png
 
     3D FDTD Yee cell
 		
@@ -45,7 +45,7 @@ One of the most challenging issues in modelling *open boundary* problems, such a
 
 .. _abcs:
 
-.. figure:: images/abcs.pdf
+.. figure:: images/abcs.png
 
     GPR forward problem showing computational domain bounded by Absorbing Boundary Conditions (ABCs)
 		
@@ -63,7 +63,7 @@ A right-handed Cartesian coordinate system is used with the origin of space coor
 
 .. _coord3d:
 
-.. figure:: images/coord3d.pdf
+.. figure:: images/coord3d.png
 
     gprMax coordinate system and conventions.