Font size of Figure Caption Header

Question

My question is about changing the font size.

I have to insert two figures side by side. Coming to inserting the captions for the figures individually:

Figure 3: blah blah.....................Figure 4: blah blah...

I am able to change the font size of "blah blah". What I want to know is how to change the font size of "Figure 3" or "Figure 4", say the figure headers or something. I do not know what they are called to search on-line.

Answer 1

You can do this (and more!) with the caption package

\usepackage[font=small,labelfont=bf]{caption}

will make Figure in bold, and make the caption content small.

Referencing Section 2.3 of the documentation, the size options for font are as follows:

• scriptsize
• footnotesize
• small
• normalsize
• large
• Large

Here's a MWE to play with

\documentclass{article}

\usepackage[font=scriptsize]{caption}
\usepackage{mwe}

\begin{document}

\begin{figure}
\centering
\begin{minipage}{.4\textwidth}
  \includegraphics[width=\textwidth]{example-image-a}
  \caption{My caption here}
\end{minipage}%
\hfill
\begin{minipage}{.4\textwidth}
  \includegraphics[width=\textwidth]{example-image-b}
  \caption{My other caption here}
\end{minipage}
\end{figure}

\end{document}

Answer 2

Not sure why but the answer above did not work for me. If that's the case for you, simply declare:

\usepackage{caption}
\captionsetup[figure]{font=small}

For more detail see: Changing Figure caption text size..

Answer 3

The reason that sciposter's code isn't working is that in more pedantic systems it requires:

\usepackage[font={small},labelfont={bf}]{caption}