Index: Makefile
==================================================================
--- Makefile
+++ Makefile
@@ -1,27 +1,27 @@
-PNGS = pngs/network-private.png pngs/network-public.png pngs/network-community.png
-PNGS_BEAMER = pngs/confine,background.png
+IMGS = imgs/network-private.png imgs/network-public.png imgs/network-community.png
+IMGS_BEAMER = imgs/confine,background.pdf
 
 .PHONY:	clean
 
 all:	slides,lightning.pdf
 
-slides,lightning.pdf:	script,lightning.txt $(PNGS) slides-header.tex $(PNGS_BEAMER)
+slides,lightning.pdf:	script,lightning.txt $(IMGS) slides-header.tex $(IMGS_BEAMER)
 	pandoc -t beamer -H slides-header.tex slides,lightning.txt -o $@
 
-slides,lightning.html:	script,lightning.txt $(PNGS)
+slides,lightning.html:	script,lightning.txt $(IMGS)
 	pandoc -t dzslides --self-contained script,lightning.txt -o $@
 
-pngs/confine,background.png:	logos/confine,logo.svg
-	inkscape -z -D -e $@ -w 1024 $<
+imgs/confine,background.pdf:	logos/confine,logo.svg
+	inkscape -z -D -A $@ $<
+
+imgs/network-private.png:	diagrams/network-private.dia
+	dia -e $@ -s 1024x $<
 
-pngs/network-private.png:	diagrams/network-private.dia
+imgs/network-public.png:	diagrams/network-public.dia
 	dia -e $@ -s 1024x $<
 
-pngs/network-public.png:	diagrams/network-public.dia
-	dia -e $@ -s 1024x $<
-
-pngs/network-community.png:	diagrams/network-community.dia
+imgs/network-community.png:	diagrams/network-community.dia
 	dia -e $@ -s 1024x $<
 
 clean:
-	rm -f $(PNGS) $(PNGS_BEAMER) slides,lightning.pdf slides,lightning.html
+	rm -f $(IMGS) $(IMGS_BEAMER) slides,lightning.pdf slides,lightning.html

Index: slides,lightning.txt
==================================================================
--- slides,lightning.txt
+++ slides,lightning.txt
@@ -12,19 +12,19 @@
     - Mutual agreement texts
 - Key for EU Digital Agenda
 
 # CNs / Privately-owned network (1/3)
 
-![Private network and private services](pngs/network-private.png)
+![Private network and private services](imgs/network-private.png)
 
 # CNs / Publicly-owned network (2/3)
 
-![Public network and private services](pngs/network-public.png)
+![Public network and private services](imgs/network-public.png)
 
 # CNs / Community network (3/3)
 
-![Community network and private services](pngs/network-community.png)
+![Community network and private services](imgs/network-community.png)
 
 # Community networks (CNs)
 
 - Broadband self-provision
 - Similar to Free software:

Index: slides-header.tex
==================================================================
--- slides-header.tex
+++ slides-header.tex
@@ -5,12 +5,12 @@
   \vbox to \paperheight {
     \vfil
     \hbox to \paperwidth {
       \hfil
       \tikz\node[opacity=0.25] {
-        \includegraphics[width=0.75\textwidth]{pngs/confine,background.png}
+        \includegraphics[width=0.75\textwidth]{imgs/confine,background.pdf}
       };
       \hfil
     }
     \vfil
   }
 }