Caption alignment below figure [duplicate]

Question

I need to edit my previous question about caption width below the figure. The goal is to have a caption exactly the same width as the figure. I was recommended to use caption package and the command \captionsetup{width=x} to make the width of the caption the same as the width of the figure by specifying x equal to the width of the figure. However, I am doing a presentation and it seems that this is not working here, when I do this, caption is still much wider than the figure as you can see in the image attached below.

Also, I want to use the command \setbeamertemplate{caption}{\raggedright\insertcaption\par} to get rid of the "Figure:" before the caption and this is not working either now, but if I exclude \usepackage{caption} from my preamble, it is working fine. Here is my code now:

\PassOptionsToPackage{table}{xcolor}
\documentclass[xcolor=svgnames]{beamer}

%\PassOptionsToPackage{svgnames}{xcolor}
%\documentclass[xcolor=table]{beamer}
%
% Choose how your presentation looks.
%
% For more themes, color themes and font themes, see:
% http://deic.uab.es/~iblanes/beamer_gallery/index_by_theme.html
%
\mode<presentation>
{
  \usetheme{Warsaw}      % or try Darmstadt, Madrid, Warsaw, ...
  \usecolortheme{default} % or try albatross, beaver, crane, ...
  \usefonttheme{default}  % or try serif, structurebold, ...
  \setbeamertemplate{navigation symbols}{}
%  \setbeamertemplate{caption}[numbered]
%\setbeamercolor{section in head/foot}{bg=NavyBlue}
}

\usepackage[english]{babel}
\usepackage[utf8x]{inputenc}
\usepackage{graphicx}
\usepackage{hyperref}
\usepackage{amsmath}
\usepackage{xcolor}
\usepackage{tabu}
\usepackage{booktabs}% for better rules in the table
\usepackage{ragged2e}
\usepackage{rotating}
\usepackage{caption}


\title[Thesis Defense]{Name of the thesis}
\subtitle{Thesis Defense}
\author{}
 \institute{}
\date{January 31, 2018}

\begin{document}
\setbeamertemplate{caption}{\raggedright\insertcaption\par}
\setbeamerfont{caption}{size=\tiny}

\begin{frame}[plain]
  \titlepage
\end{frame}

\begin{frame}{Motivation}
\begin{figure}
\centering
\captionsetup{width=90mm}
\small{Appreciation of house prices and policy rate} \par
%\label{fig:circulation}
\includegraphics[width=90mm,height=0.5\textheight,keepaspectratio]{WuXia_rate_Real_HPI}

\caption{\textit{Shaded area marks the pre-crisis period in which effective federal funds rate was below the Taylor rule rate.}}
%\begin{source} National central banks \end{source}
\end{figure}

\begin{itemize}
\item 
\item
\end{itemize}

\end{frame}



\end{document}

Answer 1

You could use the measuredfigure environment as described here (by Bernard) and shown in the following MWE:

\documentclass[xcolor=svgnames]{beamer}

\mode<presentation>
{
  \usetheme{Warsaw}
  \usecolortheme{default}
  \usefonttheme{default}
  \setbeamertemplate{navigation symbols}{}
}
\setbeamertemplate{caption}{\raggedright\insertcaption\par}
\setbeamerfont{caption}{size=\tiny}

\usepackage[english]{babel}
\usepackage[utf8x]{inputenc}
\usepackage{threeparttable}

\begin{document}
\begin{frame}{Motivation}
\begin{figure}
\centering
\small{Appreciation of house prices and policy rate} \par
\begin{measuredfigure}
\includegraphics[width=90mm,height=0.5\textheight,keepaspectratio]{example-image}
\caption{\textit{Shaded area marks the pre-crisis period in which effective federal funds rate was below the Taylor rule rate.}}
\end{measuredfigure}
\end{figure}

\begin{itemize}
\item 
\item
\end{itemize}
\end{frame}
\end{document}

Answer 2

The caption package provides a width that allows you to adjust the width for each figure individually. This way you can adjust the width to suit the width of your figure. If all your figures have the same width, you can set the option \captionsetup{width=<len>} globally.