Exporting TikZ to EPS using MacTex

Question

I have followed the instructions for exporting to an .eps file from a TikZ drawing provided here: https://tex.stackexchange.com/a/8646/8078. However, I cannot get any of the methods to produce an .eps file successfully.

I am working on a MAC, OS 10.6.8, running MacTeX via TexShop.

When I use the following code, a .pdf is created, but no .eps file is created. Here is the code:

\documentclass{article}
\usepackage[usenames,dvipsnames]{xcolor}
\usepackage{tikz}

\usetikzlibrary{external}

\tikzset{external/system call={pdflatex \tikzexternalcheckshellescape -halt-on-error 
-interaction=batchmode -jobname "\image" "\texsource" &&
pdftops -eps "\image".pdf}}
\tikzexternalize

\begin{document}

\tikzset{external/force remake}

\begin{tikzpicture}[yscale=3.5,xscale=4.5]

\draw[->] (0,0) -- (2,0) node[below, text width=2cm] {Before Tax Income $z$};
\draw[->] (0,0) -- (0,2) node[below left, text width=1.8cm] {After Tax Income $z - T(z)$};

\begin{scope}
\clip (0,0) rectangle (1,2);
\draw (0,0) -- (1.5,1.5);
\end{scope}

\begin{scope}
\clip (1,0) rectangle (2,2);
\draw (0,0) -- (1.5,1.5);
\end{scope}

\draw[rotate around={45:(1,1)},red] (.6,1.1) node[left] {$L$} parabola bend (1,1) (1.4,1.1);

\draw[shift={(.125,.125)},rotate around={45:(1,1)},cyan] (.6,1.1) node[left] {$M$} parabola bend (1,1) (1.4,1.1);

\draw[shift={(.25,.25)},rotate around={45:(1,1)},ForestGreen] (.6,1.1) parabola bend (1,1) (1.4,1.1) node[right] {$H$};

\draw[dashed] (1,0) node[below] {\textcolor{red}{$z^{*}$}} -- (1,2);

\draw[dashed] (1.25,0) node[below] {\textcolor{ForestGreen}{$z^{*}+\triangle z^{*}$}} -- (1.25,2);

\path (.15,.1) node[right] {slope = $1-t$};

\end{tikzpicture}

\end{document} 

As suggested in https://tex.stackexchange.com/a/8646/8078, I also try alternative ways to create the .eps, namely, using the following code, where the system call is changed, and latex is used to compile, rather than pdflatex:

\documentclass{article}
\usepackage[usenames,dvipsnames]{xcolor}
\usepackage{tikz}

\usetikzlibrary{external}

\tikzset{external/system call={latex \tikzexternalcheckshellescape -halt-on-error
-interaction=batchmode -jobname "\image" "\texsource";
dvips -o "\image".ps "\image".dvi;
ps2eps "\image.ps"}}
\tikzexternalize

\begin{document}

\tikzset{external/force remake}

\begin{tikzpicture}[yscale=3.5,xscale=4.5]

\draw[->] (0,0) -- (2,0) node[below, text width=2cm] {Before Tax Income $z$};
\draw[->] (0,0) -- (0,2) node[below left, text width=1.8cm] {After Tax Income $z - T(z)$};

\begin{scope}
\clip (0,0) rectangle (1,2);
\draw (0,0) -- (1.5,1.5);
\end{scope}

\begin{scope}
\clip (1,0) rectangle (2,2);
\draw (0,0) -- (1.5,1.5);
\end{scope}

\draw[rotate around={45:(1,1)},red] (.6,1.1) node[left] {$L$} parabola bend (1,1) (1.4,1.1);

\draw[shift={(.125,.125)},rotate around={45:(1,1)},cyan] (.6,1.1) node[left] {$M$} parabola bend (1,1) (1.4,1.1);

\draw[shift={(.25,.25)},rotate around={45:(1,1)},ForestGreen] (.6,1.1) parabola bend (1,1) (1.4,1.1) node[right] {$H$};

\draw[dashed] (1,0) node[below] {\textcolor{red}{$z^{*}$}} -- (1,2);

\draw[dashed] (1.25,0) node[below] {\textcolor{ForestGreen}{$z^{*}+\triangle z^{*}$}} -- (1.25,2);

\path (.15,.1) node[right] {slope = $1-t$};

\end{tikzpicture}

\end{document}

In this case, I get the following error message:

./tikz_eps2.tex:55: Package tikz Error: Sorry, the system call 'latex -shell-es cape -halt-on-error -interaction=batchmode -jobname "tikz_eps2-figure0" "\def\t ikzexternalrealjob{tikz_eps2}\input{tikz_eps2}"; dvips -o "tikz_eps2-figure0".p s "tikz_eps2-figure0".dvi; ps2eps "tikz_eps2-figure0.ps"' did NOT result in a u sable output file 'tikz_eps2-figure0' (expected one of .pdf:.jpg:.jpeg:.png:). Please verify that you have enabled system calls. For pdflatex, this is 'pdflat ex -shell-escape'. Sometimes it is also named 'write 18' or something like that . Or maybe the command simply failed? Error messages can be found in 'tikz_eps2 -figure0.log'. If you continue now, I'll try to typeset the picture.

I hit return, latex continues to compile a .pdf. As a result, a .ps is created that I can open, but the .eps file that is created is "empty." That is, when I try to open the .eps it with Preview, I get the error "Warning: Empty Job. No PDF file produced." Or, if I open the .eps file in Adobe Illustrator, all that shows is a blank canvace.

Finally, I also use this syntax for the extranlize command:

\tikzset{external/system call={latex \tikzexternalcheckshellescape -halt-on-error
-interaction=batchmode -jobname "\image" "\texsource" && 
dvips -o "\image".ps "\image".dvi &&
ps2eps "\image.ps"}}
\tikzexternalize[shell escape=-enable-write18]

After this, I get the same result as in the second case.

I should also mention that I try to directly use ps2eps to convert the .ps an .eps in OS X Terminal. I get the following message in Terminal:

Input files: /Users/nomad/Dropbox/tex_remote/TiKz/tikz_eps2-figure0.ps Processing: /Users/nomad/Dropbox/tex_remote/TiKz/tikz_eps2-figure0.ps Rendering with existing %%BoundingBox: 0 0 345 225 Calculating Bounding Box...ready. %%BoundingBox: 4 3 332 225 Creating output file /Users/nomad/Dropbox/tex_remote/TiKz/tikz_eps2-figure0.eps ... ready.

However, the resulting .eps is still "blank" as in the previous cases.