\documentclass{article}
\usepackage[margin=1cm,paperwidth=20cm,paperheight=100cm]{geometry}
\usepackage[]{xcolor}
\usepackage[export]{adjustbox}
\fboxsep=0pt
\parskip=1cm

\usepackage[tightpage]{preview}

\usepackage{standalone}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{tikz}
\newdimen\unit
\tikzset{unit/.code={\unit=\dimexpr#1\relax}}
\tikzset{xy/.style={x={#1},y={#1},unit={#1},font={\sffamily\fontsize{.2\unit}{.24\unit}\selectfont},line width=.01\unit}}

\def\showdiff#1{%
    {%
    \diff=\dimexpr#10-#11\relax
    \pgfmathsetlength\absdiff{abs(\diff)}%
    \ifdim\diff=0pt%
        \textcolor{green}{PASSED}%
    \else
        \ifdim\absdiff<\Epsilon
            \pgfmathtruncatemacro\FCOLOR{100*(\Epsilon-abs(\absdiff))/\Epsilon}%
            \textcolor{green!\FCOLOR!yellow}{OK: \the\diff}%
        \else
            \textcolor{red}{FAILED: \the\diff}%
        \fi
    \fi
    \quad
    \ifdim#11=0pt
        \diff=#10
    \else
        \pgfmathsetlength\diff{(#10/#11) - 1pt}
    \fi
    \ifdim\diff<0pt
        \absdiff=-\diff
    \else
        \absdiff=\diff
    \fi
    \ifdim\diff=0pt%
        \textcolor{green}{PASSED}%
    \else
        \ifdim\absdiff<\dEpsilon
            \pgfmathtruncatemacro\FCOLOR{100*(\dEpsilon-abs(\absdiff))/\dEpsilon}%
            \textcolor{green!\FCOLOR!yellow}{OK: \the\diff}%
        \else
            \textcolor{red}{FAILED: \the\diff}%
        \fi
    \fi
    }%
}

\newlength\diff
\newlength\absdiff
\newlength\Epsilon
\newlength\dEpsilon
\Epsilon=0.05pt
\dEpsilon=0.001pt
\def\test#1#2{%
    \begin{preview}%
    \sbox0{\includegraphics[#1]{#2}}%
    \sbox1{\adjustbox{#1}{\input{#2}\unskip}}%
    \begin{tabular}{ll@{}l}
    \usebox0 & \usebox1 & .\\
    \the\ht0 & \the\ht1 & \showdiff\ht \\
    \the\dp0 & \the\dp1 & \showdiff\dp \\
    \the\wd0 & \the\wd1 & \showdiff\wd \\
    \end{tabular}%
    \end{preview}%
}

\begin{document}
\ttfamily

\test{}{gridbp}

\test{}{gridpt}

\test{clip,trim=10bp 20bp 0 0,width=177bp,frame=1pt 1pt}{gridbp}

\test{clip,trim=10pt 20pt 0 0,width=177pt,frame=1pt 1pt}{gridpt}

\test{angle=45,clip,trim=10bp 0 0 0,width=177bp,totalheight=5cm,frame}{gridbp}

\test{clip,trim=10pt 0 0 0,angle=90,trim=5pt 0 0 0}{gridbp}

\test{angle=180,totalheight=5cm}{gridbp}

\test{width=3cm,angle=0,totalheight=5cm}{gridbp}

\test{width=3cm,totalheight=5cm,angle=180}{gridbp}

\test{width=3cm,totalheight=5cm}{gridbp}

\test{margin=.5cm .5cm .5cm .5cm,frame}{gridbp}
\end{document}

\test{width=2cm,
margin=.1cm .1cm .1cm .1cm,frame,angle=5,
margin=.1cm .1cm .1cm .1cm,frame,angle=5,
margin=.1cm .1cm .1cm .1cm,frame,angle=5,
margin=.1cm .1cm .1cm .1cm,frame,angle=5,
margin=.1cm .1cm .1cm .1cm,frame,angle=5,
margin=.1cm .1cm .1cm .1cm,frame,angle=5,
margin=.1cm .1cm .1cm .1cm,frame,angle=5,
margin=.1cm .1cm .1cm .1cm,frame,angle=5,
margin=.1cm .1cm .1cm .1cm,frame
}{gridbp}

\test{width=2cm,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
margin=1pt 1pt 1pt 1pt,frame,angle=1,
}{gridbp}

\end{document}

\adjustbox{width=2cm,trim={.5\WIDTH} 0 0 0,frame}{Ag}
