how can I set the subfigure labels in latex to uppercase?

Question

I made a figure within my latex document using the subfigure package, containing three subfigures. The part where the subfigures are now automatically labelled (a), (b), (c) needs to be uppercase, though.

i.e. the result from the latex code in the finally rendered PDF is

(a) img1 (b) img2 (c) img3

but it needs to be

(A) img1 (B) img2 (C) img3

How can I set this?

The code looks something like this:

    \usepackage{subfigure}
[...]
    \begin{sidewaysfigure}[p]
        \centering
        \subfigure[image1]{
            \label{fig:img1}
            \includegraphics[scale=2]{figures/img1.png}
        }
        \subfigure[image2]{
            \label{fig:img2}
            \includegraphics[scale=2]{figures/img2.png}
        }
        \subfigure[image3]{
            \label{fig:img3}
            \includegraphics[scale=2]{figures/img3.png}
        }
        \caption[my images]{\textbf{ My images} I am referring to (A), (B) and (C) respectively.}\label{fig:imgs}\end{sidewaysfigure}

Answer 1

To force capital letters, put the offending character in curly brackets.

\caption[my images]{\textbf{ My images} I am referring to ({A}), ({B}) and ({C}) respectively.}\label{fig:imgs}\end{sidewaysfigure}

Answer 2

I didn't try this, but putting

\renewcommand{\thesubfigure}{(\Alph{subfigure})}

in your preamble should do it.

Answer 3

i have the same problem. How can i label the subfigures in upper case as (A), (B) and (C) instead of (a), (b) and (c). Can some one suggest me the solution? Below are the lines i use:

\begin{figure}[H]

\centering

\begin{tabular}{c}

\subfloat[][]{\label{fig:figure1a}

\includegraphics[width=0.8\textwidth]{Figure1A}}\

\subfloat[][]{\label{fig:figure1b}

\includegraphics[width=0.8\textwidth]{figure1B}}\

\subfloat[][]{\label{fig:figure1c}

\includegraphics[width=0.8\textwidth]{figure1C}}

\end{tabular}

Answer 4

In answer to the new question within an answer by salmaaries, here is a tested, working version using the suggestion from AVB:

\documentclass{article}
\usepackage{graphicx}
\usepackage{subfig}
\renewcommand{\thesubfigure}{\Alph{subfigure}}
\begin{document}
    \begin{figure}[H]
        \centering
        \begin{tabular}{c}
            \subfloat[First caption]{\label{fig:figure1a}}
             \includegraphics[width=0.8\textwidth]{Figure1A}\\
             \subfloat[Second caption]{\label{fig:figure1b}}
             \includegraphics[width=0.8\textwidth]{figure1B}\\
             \subfloat[Third caption]{\label{fig:figure1c}}
            \includegraphics[width=0.8\textwidth]{figure1C}
        \end{tabular} 
    \end{figure}
\end{document}