diff --git a/make-includes/standard_rules.make b/make-includes/standard_rules.make
index a6afd02..c477d9e 100644
--- a/make-includes/standard_rules.make
+++ b/make-includes/standard_rules.make
@@ -128,7 +128,7 @@
 # Includes both blurred and unblurred versions, use as required.
 #
 # Unblurred:
-convert_bg = $(CONVERT) "$(1)" -threshold "-1" -depth 16 - | $(COMPOSITE) -dissolve 33% "$(1)" - "$(2)"
+convert_bg = $(CONVERT) "$(1)" -fill white -colorize 67% "$(2)"
 
 %-BG.png: %.tif
 	$(call convert_bg,$<,$(IMGDIR)/$@)
@@ -143,19 +143,19 @@
 	$(call convert_bg,$<,$(IMGDIR)/$@)
 #
 # Blurred:
-convert_bg_blur = $(CONVERT) -blur 0.5 "$(1)" "$(2)"; $(CONVERT) "$(2)" -threshold "-1" -depth 16 - | $(COMPOSITE) -dissolve 33% "$(2)" - "$(3)"; rm -f "$(2)"
+convert_bg_blur = $(CONVERT) -blur 0.5 -fill white -colorize 67% "$(1)" "$(2)"
 
 %-BG-blur.png: %.tif
-	$(call convert_bg_blur,$<,$(IMGDIR)/$*-tmp.png,$(IMGDIR)/$@)
+	$(call convert_bg_blur,$<,$(IMGDIR)/$@)
 
 %-BG-blur.png: %.png
-	$(call convert_bg_blur,$<,$(IMGDIR)/$*-tmp.png,$(IMGDIR)/$@)
+	$(call convert_bg_blur,$<,$(IMGDIR)/$@)
 
 %-BG-blur.png: %.jpg
-	$(call convert_bg_blur,$<,$(IMGDIR)/$*-tmp.png,$(IMGDIR)/$@)
+	$(call convert_bg_blur,$<,$(IMGDIR)/$@)
 
 %-BG-blur.png: %.pict
-	$(call convert_bg_blur,$<,$(IMGDIR)/$*-tmp.png,$(IMGDIR)/$@)
+	$(call convert_bg_blur,$<,$(IMGDIR)/$@)
 #
 # PNG from XCF.
 #