Why does convert=ghostscript destroy equations on high density?

I want to create a high-resolution png to include it into a A0-poster. My Idea was to use the standalone package with the convert=ghostscript option.

\documentclass[border=2pt,convert={ghostscript, density={4000}}, varwidth]{standalone}
\usepackage{amsmath}

\begin{document}
\begin{align}
\partial_tx(z,t) &=
\Lambda(z)\partial_z^2x(z,t) + \Phi(z)\partial_zx(z,t) + A(z)x(z,t)
\label{pdes}\\
\partial_zx(0,t) &= Q_0x(0,t),\\
\partial_zx(1,t) &= Q_1x(1,t) + u(t),
\end{align}
\end{document}


And here is the result:

I have installed ghostscript version 9.27 and tried both 32 and 64 bit version, both with the same result. Interestingly, the result depends on the density, it works fine until about 3500. For 10000, the symbols are no more flipped but there are huge white spaces between the symbols. What's the matter with that and how can I avoid this?

• What software is the poster being made in? Doesn't it support vector graphics? Output of pdflatex is vector graphics, so is output of latex + dvips (-E). – daleif Jun 17 at 9:54
• Works fine with Ghostscript 9.26 and TeXLive 2019. Note that we have heard of several bug in ghostscript 9.27 so you might be getting hit by one of those. – daleif Jun 17 at 9:57
• @daleif I want to include the picture in PowerPoint. Tried eps but powerpoint can't show the image. Is there a better way than a high-res bitmap? – Ktree Jun 17 at 10:30
• PoiwerPoint should be able to handle EPS. Why not just do he entire poster in LaTeX to begin with. – daleif Jun 17 at 10:52
• I would probably, but its a collaboration, so not in my hand. Think I won't come around using some additional software like inkscape... – Ktree Jun 17 at 13:50

1 Answer

Generated PDF with normal pdflatex, then opened in Inkscape and saved as PNG with 4000dpi reslution: (see a small details, it's a monster PNG):