问我怎样才能从乳胶中生成好看的png图像？

EN

SOURCE = symbol
DELAY = 80
DENSITY = 300
WIDTH = 512

make:
    pdflatex $(SOURCE).tex -output-format=pdf
    make clean

clean:
    rm -rf  $(TARGET) *.class *.html *.log *.aux *.data *.gnuplot

gif:
    pdfcrop $(SOURCE).pdf
    convert -verbose -delay $(DELAY) -loop 0 -density $(DENSITY) $(SOURCE)-crop.pdf $(SOURCE).gif
    make clean

png:
    make svg
    inkscape $(SOURCE).svg -w $(WIDTH) --export-png=$(SOURCE).png

transparentGif:
    convert $(SOURCE).pdf -transparent white result.gif
    make clean

svg:
    make
    #inkscape $(SOURCE).pdf --export-plain-svg=$(SOURCE).svg
    pdf2svg $(SOURCE).pdf $(SOURCE).svg
    # Necessary, as pdf2svg does not always create valid svgs:
    #inkscape $(SOURCE).svg --export-plain-svg=$(SOURCE).svg