[Tex/LaTex] tex4ht: reuse png images instead of creating new ones

graphicstex4ht

I have a lot of PNG images in my document, which (the document) I'd like to convert to HTML using tex4ht (htlatex). Now the images need to be in EPS format, as htlatex uses DVI mode. So I run convert foo.png foo.eps before I run htlatex. When generating the HTML, tex4ht creates a new PNG out of these EPS images, although I have the original which could (should) be used instead. That would save me quite some time and space.

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{graphicx}
\begin{document}

\section{something}
\includegraphics[width=5cm]{mill}
\end{document}

(mill.png is from the ConTeXt distribution, but could be any PNG file.)

Best Answer

You must provide extension for your graphics file:

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{graphicx}
\begin{document}

\section{something}
\includegraphics[width=5cm]{mill.png}
\end{document}

This compiles fine without need for the eps step

Related Solutions

[Tex/LaTex] Conflict between color, graphicx and libertine

These option clashes happen when a package is requested to be loaded on two different positions, like by you and inside another package, but with different options. The package is loaded by the first \usepackage (or its twin \RequirePackage); it isn't loaded again when it is requested again. It simply can't be loaded a second time. Therefore the new options can be activated and previous options might conflict with the second usage. So LaTeX creates an error to report this issue to you.

The way to fix this is to declare the options beforehand using \PassOptionsToPackage{<options>}{<package>}. Then they are used wherever the package is loaded.

\documentclass{article}
\usepackage{ifpdf}
\ifpdf
    \PassOptionsToPackage{pdftex,usenames,dvipsnames}{color}
    \usepackage[T1]{fontenc}
    \usepackage{libertine} % most likely loads 'color' itself
    %\usepackage{lmodern} % doesn't load 'color'
    \usepackage{color}
    \usepackage[pdftex]{graphicx}
\else
    %\bye
\fi
\begin{document}
Hello, world!
\end{document}

I can't test it by myself, because I don't have the libertine package installed.

PS:

I don't think you need to set pdftex manually. Normally packages do a good job recognizing the driver by themselves. Also you might want to use the extended xcolor package instead of color.

[Tex/LaTex] Can pdflatex (or any tex package) automatically rescale included images which have been reduced in size

I've tried a little black magic with LaTeX, and found out how to do it without external scripts ─ though it still is somewhat dirty and not that easy to use. Basically, you would need to call ImageMagick from inside LaTeX.

To do this, you need to call it with --shell-escape parameter. This allows for using a command named \write18, that executes a parameter passed to it. Then you could add the following code to the preamble:

\newcommand{\doConvert}[2]{\immediate\write18{convert #1 -resample %
  300x300 -resize #2 #1.rs}}
\newcommand{\imgRs}[4]{\doConvert{#1.#2}{#3x#4}%
  \includegraphics[width=#3, height=#4, type=#2, ext=.#2.rs, read=.#2.rs]{#1}%
}

This enables you to call \imgRs{file}{extension}{width_in_pts}{height_in_pts} in order to convert the image to 300 dpi and include it in the document.

Of course you could always specify the dimensions in inches or any other units: you would just have to change the call to \doConvert in imgRs to account for scaling from unit used to points -- and you would have to use the dimensions consistently. It could be possible to actually find out what were the units used, or make some parameters optional, but it's independent of this solution.

Best Answer

Related Solutions

[Tex/LaTex] Conflict between color, graphicx and libertine

PS:

[Tex/LaTex] Can pdflatex (or any tex package) automatically rescale included images which have been reduced in size

Related Question