How to vertically align headers/footers in fancyhdr package?

Question

I'm using fancyhdrpackage for headings and footers. I have defined left-header as a big image, and I want to vertically align (to the top or to the center, the default is to the bottom) the text from the right-header. How can I do that?

\usepackage{fancyhdr}
\pagestyle{fancy}

\lhead{\includegraphics[height=21mm]{some_fancy_logo.pdf}}
\chead{}
\rhead{I want to vertically align THIS text}

Answer 1

\documentclass{article}
\usepackage[demo]{graphicx}
\usepackage{fancyhdr}
\pagestyle{fancy}

\lhead{\raisebox{-0.5\height}{\includegraphics[height=21mm]{some_fancy_logo.pdf}}}

\chead{}

\rhead{I want to vertically align THIS text}

\begin{document}
abc
\end{document}

And don't ignore the warning of fancyhdr:

Package Fancyhdr Warning: \headheight is too small (12.0pt): 
 Make it at least 59.75078pt.

Use \headheight=22mm or something like this.

Answer 2

I think the problem is that in fancyhdr there is no easy way to communicate the width of a box in the left header to the right header. You could allocate a dimen register, place the width of the box in the left header into it, and use it in the right header, but I think much easier solution is to just place everything into the same header:

\lhead{\hbox to \hsize{%
       \hbox{\vtop{\vskip 0pt \hbox{\includegraphics[height=21mm]{some-fancy-logo.pdf}}}}%
       \hfill\hbox{\vtop{\vskip 0pt \hbox{I want to vertically align THIS text}}}}}
\chead{}
\rhead{}

You probably don't even need fancyhdr.

Answer 3

I got a solution. It's a very ugly hack, but it works in my case (because I know in advance the height of the header).

\rhead{\parbox[b][21mm][t]{0.5\textwidth}{\raggedleft I want to vertically align THIS text}}

I'm accepting better solutions. :)