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}

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