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)" need to be uppercased, 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 up?

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}

```