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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.

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Welcome to TeX.sx! While cmhughes' answer is a very good one some classes like KOMA-Script or memoir have their own ways to do these things which is why a minimal working example (MWE) would be a good addition to your question. –  cgnieder Dec 8 '12 at 16:29
    
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1 Answer

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}

screenshot

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Thank you for your reply.... I do not know its not working for me...I am actually using Lyx...I tried writing this command in preamble its not working either –  Jeshwanth Kundem Dec 8 '12 at 16:38
    
@JeshwanthKundem you're welcome :) When you say 'not working', does that mean not producing the output, or not compiling, or something else? Perhaps an update is in order: How do I update my TeX distribution? –  cmhughes Dec 8 '12 at 16:39
    
its compiling..I mean to say..i am not getting what I want...you understood my question right...the part "Figure 3" I need to change the font of this –  Jeshwanth Kundem Dec 8 '12 at 16:42
1  
@JeshwanthKundem It should work in LyX, too. You should perhaps read the caption manual to find out which options you need. –  cgnieder Dec 8 '12 at 16:46
2  
@JeshwanthKundem great, glad it's fixed :) if this finishes the question, then please consider accepting my answer by using the green check mark, and upvoting my answer once you have enough reputation to do so :) welcome! –  cmhughes Dec 8 '12 at 16:54
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