Use PNG image for README

Author: JanLuca

README.md

@@ -1,4 +1,4 @@
-![Logo of the variPEPS library with a triangular-PEPS norm as picture and "variPEPS -- Variational PEPS Library" as text right of it](/docs/source/images/logo.svg)
+![Logo of the variPEPS library with a triangular-PEPS norm as picture and "variPEPS -- Variational PEPS Library" as text right of it](/docs/source/images/logo.png)
 
 # variPEPS -- Versatile tensor network library for variational ground state simulations in two spatial dimensions.
 

docs/source/images/Makefile

@@ -7,14 +7,17 @@ SVGS := $(SRCS:%.tex=%.svg)
 AUXS := $(SRCS:%.tex=%.aux)
 TEXLOGS := $(SRCS:%.tex=%.log)
 
-all: ${PDFS} ${SVGS}
+all: ${PDFS} ${SVGS} logo.png
 
 %.pdf: %.tex
 	pdflatex "$<"
 
 %.svg: %.pdf
 	inkscape --pdf-poppler "$<" -o "$@"
 
+%.png: %.pdf
+	inkscape --pdf-poppler "$<" -b FFFFFF --export-dpi=150 --export-png="$@"
+
 texauxclean:
 	rm -f ${AUXS}
 	rm -f ${TEXLOGS}