tikz “Latex” arrowhead artifact on conversion to png using ImageMagick if opacity < 1











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This is a specific problem, but I find it comes up often in my workflows:




  • generate a standalone tikz diagram with:


    • some transparent object(s) - i.e. opacity < 1

    • arrows, where I prefer the large style: > = Latex from the tikz library arrows.meta



  • run ImageMagick convert to convert .pdf to .png


The problem is, Latex style arrowheads develop a weird inner border on conversion to .png.



MWE



mwe.tex:



documentclass[margin=0.1cm]{standalone}

usepackage{tikz}

usetikzlibrary{arrows.meta}

begin{document}

begin{tikzpicture}

  draw[>=Latex,<->,opacity=1.00](0.0,-0.0)--(1.0,-0.0); % (1)

  draw[>=Latex,<->,opacity=0.99](0.0,-0.2)--(1.0,-0.2); % (2)

  draw[>=latex,<->,opacity=1.00](0.0,-0.4)--(1.0,-0.4); % (3)

  draw[>=latex,<->,opacity=0.99](0.0,-0.6)--(1.0,-0.6); % (4)

end{tikzpicture}

end{document}


compile & convert to png:



pdflatex mwe.tex && convert -density 600 mwe.pdf mwe.png


MWE result:



MWE result



About the MWE:




  • You can see the problem in arrows (1) and (2), currently

  • Arrows (3) and (4) are not affected, since they have the smaller arrowheads: > = latex

  • Only commenting (2) and (4) (opacity=0.99) solves the problem for (1) - i.e. removing all transparent objects from the image.


Questions:




  • Why is this happening?

  • Is this a tikz problem or an ImageMagick problem?

  • Any solutions besides avoiding transparency or using smaller arrowheads?


Thanks






tikz-pgf graphics tikz-arrows







share|improve this question


























    up vote
    0
    down vote

    favorite












    This is a specific problem, but I find it comes up often in my workflows:




    • generate a standalone tikz diagram with:


      • some transparent object(s) - i.e. opacity < 1

      • arrows, where I prefer the large style: > = Latex from the tikz library arrows.meta



    • run ImageMagick convert to convert .pdf to .png


    The problem is, Latex style arrowheads develop a weird inner border on conversion to .png.



    MWE



    mwe.tex:



    documentclass[margin=0.1cm]{standalone}
    
usepackage{tikz}
    
usetikzlibrary{arrows.meta}
    
begin{document}
    
begin{tikzpicture}
    
  draw[>=Latex,<->,opacity=1.00](0.0,-0.0)--(1.0,-0.0); % (1)
    
  draw[>=Latex,<->,opacity=0.99](0.0,-0.2)--(1.0,-0.2); % (2)
    
  draw[>=latex,<->,opacity=1.00](0.0,-0.4)--(1.0,-0.4); % (3)
    
  draw[>=latex,<->,opacity=0.99](0.0,-0.6)--(1.0,-0.6); % (4)
    
end{tikzpicture}
    
end{document}


    compile & convert to png:



    pdflatex mwe.tex && convert -density 600 mwe.pdf mwe.png


    MWE result:



    MWE result



    About the MWE:




    • You can see the problem in arrows (1) and (2), currently

    • Arrows (3) and (4) are not affected, since they have the smaller arrowheads: > = latex

    • Only commenting (2) and (4) (opacity=0.99) solves the problem for (1) - i.e. removing all transparent objects from the image.


    Questions:




    • Why is this happening?

    • Is this a tikz problem or an ImageMagick problem?

    • Any solutions besides avoiding transparency or using smaller arrowheads?


    Thanks






    tikz-pgf graphics tikz-arrows







    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      This is a specific problem, but I find it comes up often in my workflows:




      • generate a standalone tikz diagram with:


        • some transparent object(s) - i.e. opacity < 1

        • arrows, where I prefer the large style: > = Latex from the tikz library arrows.meta



      • run ImageMagick convert to convert .pdf to .png


      The problem is, Latex style arrowheads develop a weird inner border on conversion to .png.



      MWE



      mwe.tex:



      documentclass[margin=0.1cm]{standalone}
      
usepackage{tikz}
      
usetikzlibrary{arrows.meta}
      
begin{document}
      
begin{tikzpicture}
      
  draw[>=Latex,<->,opacity=1.00](0.0,-0.0)--(1.0,-0.0); % (1)
      
  draw[>=Latex,<->,opacity=0.99](0.0,-0.2)--(1.0,-0.2); % (2)
      
  draw[>=latex,<->,opacity=1.00](0.0,-0.4)--(1.0,-0.4); % (3)
      
  draw[>=latex,<->,opacity=0.99](0.0,-0.6)--(1.0,-0.6); % (4)
      
end{tikzpicture}
      
end{document}


      compile & convert to png:



      pdflatex mwe.tex && convert -density 600 mwe.pdf mwe.png


      MWE result:



      MWE result



      About the MWE:




      • You can see the problem in arrows (1) and (2), currently

      • Arrows (3) and (4) are not affected, since they have the smaller arrowheads: > = latex

      • Only commenting (2) and (4) (opacity=0.99) solves the problem for (1) - i.e. removing all transparent objects from the image.


      Questions:




      • Why is this happening?

      • Is this a tikz problem or an ImageMagick problem?

      • Any solutions besides avoiding transparency or using smaller arrowheads?


      Thanks






      tikz-pgf graphics tikz-arrows







      share|improve this question













      This is a specific problem, but I find it comes up often in my workflows:




      • generate a standalone tikz diagram with:


        • some transparent object(s) - i.e. opacity < 1

        • arrows, where I prefer the large style: > = Latex from the tikz library arrows.meta



      • run ImageMagick convert to convert .pdf to .png


      The problem is, Latex style arrowheads develop a weird inner border on conversion to .png.



      MWE



      mwe.tex:



      documentclass[margin=0.1cm]{standalone}
      
usepackage{tikz}
      
usetikzlibrary{arrows.meta}
      
begin{document}
      
begin{tikzpicture}
      
  draw[>=Latex,<->,opacity=1.00](0.0,-0.0)--(1.0,-0.0); % (1)
      
  draw[>=Latex,<->,opacity=0.99](0.0,-0.2)--(1.0,-0.2); % (2)
      
  draw[>=latex,<->,opacity=1.00](0.0,-0.4)--(1.0,-0.4); % (3)
      
  draw[>=latex,<->,opacity=0.99](0.0,-0.6)--(1.0,-0.6); % (4)
      
end{tikzpicture}
      
end{document}


      compile & convert to png:



      pdflatex mwe.tex && convert -density 600 mwe.pdf mwe.png


      MWE result:



      MWE result



      About the MWE:




      • You can see the problem in arrows (1) and (2), currently

      • Arrows (3) and (4) are not affected, since they have the smaller arrowheads: > = latex

      • Only commenting (2) and (4) (opacity=0.99) solves the problem for (1) - i.e. removing all transparent objects from the image.


      Questions:




      • Why is this happening?

      • Is this a tikz problem or an ImageMagick problem?

      • Any solutions besides avoiding transparency or using smaller arrowheads?


      Thanks






      tikz-pgf graphics tikz-arrows




      tikz-pgf graphics tikz-arrows






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 1 hour ago









      Jesse Knight

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