\includegraphics 在 tikz 中没有偏移

Question

我一直在尝试使用 tikz 精确定位图像article，但当我\includegraphics在定义的节点上使用时，垂直和水平方向都会有一些小的偏移。我希望下面的代码能够生成一个黑色矩形，完美地适合我绘制的线条，并且如果我不必手动添加负移位来让东西用眼睛对齐，我会更喜欢它。

任何帮助或见解都将不胜感激！

\documentclass[letterpaper]{article}
\usepackage{tikz}
\usepackage[left=0in,top=0in,right=0in,bottom=0in,verbose,nohead,nofoot]{geometry}
\usepackage[absolute,overlay]{textpos}
\thispagestyle{empty}

\begin{document}
%
 \begin{tikzpicture}[remember picture,overlay]
 \node [shift={(-8.5in,-11in)}]  at (current page.north east)
 {%
    \begin{tikzpicture}[remember picture, overlay]
% 
     \path (0.5in,0.25in)  node (p1) {}; 
     \path (3in,0.25in)    node (p2) {}; 
     \path (8in,0.25in)    node (p3) {}; 
     \path (0.5in,3.75in)  node (p4) {}; 
     \path (8in,3.75in)    node (p5) {}; 
     \path (0.5in,10.75in) node (p6) {};  
     \path (3in,10.75in)   node (p7) {};  
%
    \node[anchor=south west] at (p1.center)
     {\includegraphics[width=2.5in,height=3.5in]{./black.png}}; 
%
     \draw[very thin, blue!50] (p1.center)  to (p3.center);   
     \draw[very thin, blue!50] (p4.center)  to (p5.center);   
     \draw[very thin, blue!50] (p1.center)  to (p6.center);
     \draw[very thin, blue!50] (p2.center)  to (p7.center);
% 
     \end{tikzpicture}
 };
%
 \end{tikzpicture}
\end{document}