ch4: white background for diagram pngs

book/source/diag/fingerprint.svg

@@ -29,13 +29,14 @@
      showgrid="false"
      inkscape:zoom="2.7684424"
      inkscape:cx="-37.024429"
-     inkscape:cy="113.60179"
+     inkscape:cy="113.78239"
      inkscape:window-width="1920"
-     inkscape:window-height="1055"
+     inkscape:window-height="974"
      inkscape:window-x="0"
      inkscape:window-y="0"
      inkscape:window-maximized="1"
-     inkscape:current-layer="layer1" />
+     inkscape:current-layer="layer1"
+     inkscape:export-bgcolor="#ffffffff" />
   <defs
      id="defs892" />
   <g

book/source/diag/keypair_pub.svg

@@ -23,19 +23,20 @@
      borderopacity="0.25"
      inkscape:showpageshadow="2"
      inkscape:pageopacity="1"
-     inkscape:pagecheckerboard="0"
+     inkscape:pagecheckerboard="true"
      inkscape:deskcolor="#d1d1d1"
      inkscape:document-units="mm"
      showgrid="false"
      inkscape:zoom="3.1390218"
      inkscape:cx="36.794902"
-     inkscape:cy="39.662037"
+     inkscape:cy="39.502752"
      inkscape:window-width="1920"
-     inkscape:window-height="1055"
+     inkscape:window-height="974"
      inkscape:window-x="0"
      inkscape:window-y="0"
      inkscape:window-maximized="1"
-     inkscape:current-layer="layer1" />
+     inkscape:current-layer="layer1"
+     inkscape:export-bgcolor="#ffffffff" />
   <defs
      id="defs892" />
   <g