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}