I am using the tufte-book class and want to have the captions of the figure enviroment in a different color, especially the word 'figure 1.1'. How can you do that?
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1Since configuration and package choice hugely influence the answer to this question, we need to to provide a minimal example of the setup you are currently using. You will see this request on most questions posed by new users. – daleif Aug 23 '15 at 19:56
You can change the color of the caption using the \setcaptionfont macro provided by Tufte-LaTeX:
\documentclass{tufte-handout}
\usepackage{graphicx}
\usepackage{lipsum}% provides dummy text
% Change the color of the captions (but not sidenotes, margin notes, etc.)
\setcaptionfont{%
\normalfont\footnotesize
\color{red}% <-- set color here
}
\begin{document}
\lipsum[1]
\begin{figure}
\includegraphics[width=\linewidth]{example-image}
\caption{This is an example figure.}
\end{figure}
\lipsum[2]
\end{document}
