fix(renderings): Update soft-cover crease emulator color/location

ImageMagic changed how some color handling works, plus we added textture
scaling and dropped it in the wrong location. This gets the location and
color handling back, at least for *light* covers. Untested on dark
covers.

rules/functions.mk

@@ -256,9 +256,18 @@ define magick_barcode ?=
 endef
 
 define magick_crease ?=
-	-stroke gray95 -strokewidth $(call mmtopx,0.5) \
-	\( -size $${pagewpx}x$${pagehpx} -background none xc: -draw "line %[fx:$1$(call mmtopx,8)],0 %[fx:$1$(call mmtopx,8)],$${pagehpx}" -blur 0x$(call scale,$(call mmtopx,0.2)) -level "0x40%!" \) \
-	-compose ModulusAdd -composite
+	-gravity NorthWest \
+	\( \
+		-size $${pagewpx}x$${pagehpx} \
+		-background none \
+		xc: \
+		-stroke grey95 \
+		-strokewidth $(call mmtopx,0.5) \
+		-draw "line %[fx:$1$(call mmtopx,8)],0 %[fx:$1$(call mmtopx,8)],$${pagehpx}" \
+		-blur 0x$(call scale,$(call mmtopx,0.2)) \
+		-level "0x40%!" \
+	\) \
+	-compose Divide -composite
 endef
 
 define magick_fray ?=

rules/renderings.mk

@@ -70,10 +70,10 @@ $(BUILDDIR)/%-pov-$(_front).png: $(BUILDDIR)/%-$(_binding)-printcolor.png $$(geo
 		$< \
 		-gravity East \
 		-crop $${pagewpx}x$${pagehpx}+$${bleedpx}+0! \
-		-resize $(POVTEXTURESCALE)x \
 		$(call magick_emulateprint) \
 		$(and $(filter $(_paperback),$(call parse_binding,$@)),$(call magick_crease,0+)) \
 		$(call magick_fray) \
+		-resize $(POVTEXTURESCALE)x \
 		$@
 
 $(BUILDDIR)/%-pov-$(_back).png: $(BUILDDIR)/%-$(_binding)-printcolor.png $$(geometryfile)