font in the caption

Question

I need also in the figures and tables caption, the title be in bold not the description of them. I mean "Figure 3" in bold but the description "this is a new and beautiful image for every one like that....." ordinary font. I use these commands, it works when the caption is not too long,

\usepackage[compatibility=false,labelfont=it,textfont={bf,it}]{caption}
\captionsetup{labelfont=bf,textfont=bf}

Answer 1

For "the title [of the caption to] be in bold [but] not the description of them", i.e., if an upright font shape needs to be employed, you should issue the instruction

\usepackage[labelfont=bf,textfont=md]{caption}

and not issue a \captionsetup directive.

If the caption title should be in bold italics and the caption text in ordinary italics, you should state

\usepackage[labelfont={bf,it},textfont=it]{caption}

Don't use the compatbility=false option. The package's user guide states that "this option is neither recommended nor supported since unwanted side-effects or even errors could occur afterwards."

Answer 2

From your question, I gather that you want two things for your caption: Label should be in bold, text should be normal text.

From your code, I gather that you haven't quite decided on what you want. As pointed out by Mico, you don't need to use both \captionsetup{} and optional arguments when loading the package. Placed in the preamble like this, they would do the exact same thing. You could of course use \captionsetup{} later on in your document, to change how the caption should be for a single float, like figure or tabular.

Besides, you seem to be setting both the labelfont and textfont, when relly you just want the labelfont changed. If you want to remove changes that was put in earlier, and go back to the ordinary font, use normalfont. Example:

I also don't see why you overide the compatibility check. It is not recommended. From the documentation of caption, section 6, Package support you will find the following:

You can override this compatibility mode by specifying the option

compatibility=false

when loading the caption package. But please note that using this option is neither recommended nor supported since unwanted side-effects or even errors could occur afterwards. (For that reason you will get a warning about this.)

Output

Code

\documentclass[11pt]{article}
\usepackage[labelfont=bf]{caption}
\captionsetup{labelfont=bf}
\begin{document}

\begin{figure}[hbt]
\centering
  \rule{1cm}{1cm}
  \caption{A short caption}
\end{figure}

\begin{figure}[hbt]
\centering
  \rule{1cm}{1cm}
  \caption{A longer caption, just because sometimes, well, you're kind of stuck with them, even though you really shouldn't.}
\end{figure}

\begin{figure}[hbt]
\captionsetup{labelfont=normalfont}
\centering
  \rule{1cm}{1cm}
  \caption{A short caption, no bold label}
\end{figure}

\end{document}