Use SVG instead of PNG for latex_img

[dhermes]

It's possible to make them via

pstoedit -f plot-svg -dt -ssp 84.ps 84.svg

and to embed via

<img src="/path/to/file.svg" alt="SVG test">

My first attempt at this resulted in a non-transparent background, so the flags need some tweaking.

Some other possibilities

pdftocairo -svg latexdoc.pdf output.svg
pdf2svg file.pdf file.svg

[dhermes]

Made some progress with the standalone class

\documentclass{standalone}
\begin{document}
$\displaystyle F(V, T) = E(V) + D(T)$
\end{document}

but had some hiccups because inline math mode is not supported there. Found some helpful posts along the way.

It seems that

pdftocairo -svg {name}.pdf {name}.svg

does slightly better.

Currently comes out the wrong size / density.

UPDATE: As can be seen, they are essentially the same size 107x10 while the png generated by make_png_from_latex.convert_equation is 240x27.

These are 3 fairly different width / height ratios:

• 107 / 10 = 10.7
• 106.179 / 9.963 ~= 10.657
• 240.0 / 27 ~= 8.889

UPDATE: pdfcrop may also be useful.

[dhermes]

For an actual example

\documentclass{standalone}
\begin{document}
$\displaystyle \left( \begin{array}{cc} 1 & 1 \\ 1 & 0 \end{array} \right)^{n} \left( \begin{array}{c} 1 \\ 0 \end{array} \right) = \left( \begin{array}{cc} 1 & 1 \\ 1 & 0 \end{array} \right)^{n} \left( \begin{array}{c} F_1 \\ F_0 \end{array} \right) = \left(\begin{array}{c} F_{n + 1} \\ F_n \end{array} \right)$
\end{document}

Unfortunately this is 323x34 instead of the png which is 675x72, so we use

<blockquote style="text-align: center;">
<img style="transform: scale(2.0898); text-align: center; vertical-align: middle; border:none; box-shadow: none;" src="/images/test.pdftocairo.svg"></img>
</blockquote>

using scale.

[dhermes]

Some more examples:

\documentclass{standalone}
\DeclareMathAlphabet\mathbb{U}{msb}{m}{n}
\begin{document}
$\mathbb{F}_p$
\end{document}

gave 29x27 as a png vs the svg size of 15x14.

[dhermes]

To make the align LaTeX environment work, it was a PITA (but maybe a simpler way forward):

\documentclass{article}
\thispagestyle{empty}
\usepackage{amsthm,amssymb,amsmath}
\begin{document}
\begin{align*}
\widetilde{\alpha} = \frac{P - \sqrt{D}}{Q} &< 0 \leq X - 1 \\
\Rightarrow Q &< \sqrt{D} + (QX - P) \\
\Rightarrow Q(\sqrt{D} - (QX - P))&< D - (QX - P)^2 \\
\Rightarrow -\widetilde{\alpha}' =
\frac{\sqrt{D} - (QX - P)}{\frac{1}{Q}\left(D - (QX - P)^2\right)} &< 1
\end{align*}
\end{document}

followed by

$ pdflatex test.tex
$ pdfcrop test.pdf
$ pdftocairo -svg test-crop.pdf test-crop.pdftocairo.svg

[dhermes]

No longer relevant since LaTeX images are no more.