Frames without title still allocate space for it?

[psybers]

If I create a basic frame, with only an image in it and no title for the frame:

\begin{frame}
\centerline{\includegraphics[width=\textwidth]{images/example.png}}
\end{frame}

It looks like it still allocates space for the title, despite none being there. The image is vertically centered within the remaining space (the height of the frame, minus the title and the footer).

This looks odd, since there is no title, as the negative space above/below the image is not the same size.

Is there a way to fix that? Obviously, I could just push it upward with some vspace below, but that will not work if the image is full height (height=\textheight).

[samcarter]

Looks centred to me:

Maybe add a compilable example which allows others to reproduce the result you get? If have the title in the headline, maybe try a plain frame?

[psybers]

plain frames won't work for me, as I want to keep the footer visible.

[samcarter]

@psybers Can you show a compilable example of your problem?

[psybers]

@samcarter see below.

[josephwright]

With the current setup, the title is printed in the header not the body. The frame doesn't change layout based on the prescence of a title. Frame design in on the to-do list but not right now - and I think will require some user decision making even once we have some form of 'no header here' setup.

[psybers]

It isn't a huge deal, as I can obviously hack around it with vspace's and playing with the image height. Was just hoping there was some obvious flag that I missed that would make it behave better "out of the box."

[psybers]

\DocumentMetadata{
  tagging=on,
}
\documentclass{ltx-talk}

\title{Bug Demo}

\usepackage{graphicx}

\begin{document}

\begin{frame}
  \centerline{\includegraphics[height=\textheight]{image.png}}
\end{frame}

\end{document}

And here is the test image I used:

Compiled with: lualatex bug.tex

Gives this PDF: bug.pdf

If you measure the space above/below the image, they are not the same.

[samcarter]

You could use \newgeometry to change the geometry between frames, but why only mind asymmetric margins for frames with images?

[psybers]

We are looking at this from two different angles. From my perspective, normal slides with text look fine. Yet the slide with only an image is not vertically centered in the whitespace surrounding it.

The question still remains: why are the margins asymmetric? My assumption is that the asymmetry helps the slides with text to appear vertically centered in the implied rectangle that goes from the bottom of the frame title's text to the top of the footer. This also causes slides with images and a frame title to vertically center the image within that implied enclosure.

That behavior seems reasonable as a default, but fails on any slide that has no frame title.

[psybers]

And for anyone hitting this same issue later, note that the geometry change suggested above does not work if you have a footer, as the footer will now be much taller.

[samcarter]

You can compensate for the 2mm in the geometry settings

[josephwright]

And why are the margins asymmetric? To account for a title?

Broadly, yes - but also because like book design, there's really no reason to expect the two margins to be the same. As discussed elsewhere, currently frame design is very much a placeholder to get things moving.