beamerthemestransparency
I am using Singapore theme and want to use a background texture image for my slides. Is there a way to set the gradient in the title background to go 'from title background color to transparent' instead of 'from title background color to slide background'?
Adding -bg Transparent to dvipng works fine.
The Python-Sphinx documentation says
When you “add” an argument, you need to reproduce the default arguments if you want to keep them; that is, like this:
pngmath_dvipng_args = ['-gamma 1.5', '-D 110', '-bg Transparent']
But in the configuration file, this has to be
pngmath_dvipng_args = ['gamma', '1.5', '-D', '110', '-bg', 'Transparent']
# or
pngmath_dvipng_args = 'gamma 1.5 -D 110 -bg Transparent'.split()
You can use TikZ to place the image in a \node with the desired opacity:
\documentclass{beamer}
\usepackage{tikz}
\usebackgroundtemplate{%
\tikz\node[opacity=0.3] {\includegraphics[height=\paperheight,width=\paperwidth]{ctanlion}};}
\begin{document}
\begin{frame}
CTAN lion drawing by Duane Bibby.
\end{frame}
\end{document}
In this case, it might be convenient to use \pgfdeclareimage, \pgfuseimge:
\pgfdeclareimage[height=\paperheight,width=\paperwidth]{myimage}{cern-logo.jpg}
\usebackgroundtemplate{\tikz\node[opacity=0.3] {\pgfuseimage{myimage}};}
Best Answer
New Answer
This answer now uses the Singapore theme, (downloaded from here) and a proper definition of fading. The new
beamerthemeSingapore2.styI made the header slightly larger, such that it contains the frame title.
The main file
mwe.texwhich produces
The image is from wikimedia (Renamed to lighthouse.jpg).
Old Answer
Sorry, this answer does not use the Singapore theme, but a custom headline (which I actually prefer to the Singapore one).
I have combined answers from here and the
tikz-manual (20.3 Fadings, page 236f). I think I am not properly setting up the\shaderectangle, as there is a small gap on the right side. Better use the\tikzfadingfrom above.which produces