position caption of centered figure left-adjusted to figure

Question

I have a problem with the alignment of the caption of an image. My image is centered and I need the caption to be left-adjusted relative to my image like that:

                    -------------------
                    |                 |          
                    |      image      |
                    -------------------
                    Figure 1: my image
                    Source:              

I tried the caption package with:

\captionsetup{font=footnotesize, justification=raggedright,singlelinecheck=false}

Code to load figure:

\begin{figure}[htpb]
  \centering
  \includegraphics[width = 10cm]{Zeichnungsverfahren.png}  
  \caption[caption]{This is the caption}  
  \label{fig:zeichnungsverfahren2}
\end{figure}

but it clearly didn't work.

It gave me something like this:

                    -------------------
                    |                 |          
                    |      image      |
                    -------------------
Figure 1: my image

Source:   

I'm new with Latex so I hope you can help me out.? Greets Tony

Answer 1

There is a yet not documented macro called \captionbox in the caption package which should do what you want.

\documentclass[11pt]{article}
\usepackage[T1]{fontenc}
\usepackage{caption}

\captionsetup{
  font=footnotesize,
  justification=raggedright,
  singlelinecheck=false
}

\begin{document}
  \begin{figure}[!htb]
    \centering
    \captionbox{Caption\label{fig:dummy}}{%
      \rule{8cm}{4.5cm}
    }
  \end{figure}
\end{document}

The syntax of this command is identical to \subcaptionbox, which is described in Section 4 of the subcaption manual.

Note that the caption will now no longer exceed the width of the object at both sides.

---

---

Update

According to the comment this is an example with a new line for the source of the figure.

\documentclass[11pt]{article}
\usepackage[T1]{fontenc}
\usepackage{caption}

\captionsetup{
  font=footnotesize,
  justification=raggedright,
  singlelinecheck=false
}

\begin{document}
  \begin{figure}[!htb]
    \centering
    \captionbox[Caption]{Caption\par Source:\label{fig:dummy}}{%
      \rule{8cm}{4.5cm}
    }
  \end{figure}
\end{document}

---

Answer 2

If anyone needs the same anytime, the following code should solve.

\begin{figure}[htpb]
   \centering
    \captionbox[Text]{Zehcninasddwqe \label{fig:dummy}\subcaption*{Source: www...}}{%
     \includegraphics[width = 10cm]{zeichnen.png}  
    }   
 \end{figure}