diff --git a/doc/Logos/gf0.png b/doc/Logos/gf0.png
index e57403314..ffbe7a449 100644
Binary files a/doc/Logos/gf0.png and b/doc/Logos/gf0.png differ
diff --git a/doc/Logos/gf00.png b/doc/Logos/gf00.png
index 18c280487..056b44110 100644
Binary files a/doc/Logos/gf00.png and b/doc/Logos/gf00.png differ
diff --git a/doc/Makefile b/doc/Makefile
index 6ca9d2199..d498375b3 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -17,10 +17,10 @@ resource:
 logos:: Logos/gf00.png Logos/gf0.png
 
 Logos/gf00.png: Logos/gf00.svg Makefile
-	convert -background none -size 264x216 -depth 8 $< $@
+	convert -background 'rgba(255,255,255,0)' -size 264x216 -depth 8 $< $@
 
 Logos/gf0.png: Logos/gf0.svg Makefile
-	convert -background none -size 320x240 -depth 8 $< $@
+	convert -background 'rgba(255,255,255,0)' -size 320x240 -depth 8 $< $@
 
 ### Updating automatically generated HTML files