Assume I have some repeating texture file texture.png. I use it like this (ConTeXt, but I assume using LaTeX would not really make a difference):
\usemodule[tikz]
\starttext
\starttikzpicture[x=1mm,y=1mm, every node/.style={font={\ss\bfb}}, remember picture, overlay]
\foreach \x in {0,9,...,63}{
\foreach \y in {0,9,...,63}{
\node[anchor=north west,inner sep=0,outer sep=0] at (\x,\y) {
\externalfigure[texture.png][width=9mm,height=9mm]
};
}
}
\stoptikzpicture
\stoptext
Now when I open the resulting PDF with Preview (macOS), it renders fine. However, when I open the PDF with Adobe Reader, there are fine lines between the instances of the texture.
I create this PDF in order to print it. Do I need to worry about those lines being printed, or are they just rendering artifacts? I could try with my printer, but I will send the PDF to a printing service eventually, so I want to be sure that this is not a problem for any printer.