Adding a contour

When a text is printed over a background, it is much more readable with a contour around in overprinting the background. This contour may be white. This way, there would be a nice clearance around the text.

Another utilization would be to improve the visibility of the text with very light color for better reading on a white background.

Let's see how to achieve that.

How to do it...

Our example will use yellow color for chapter headings in a book. This is hardly readable, so we will add a contour to improve it:

1. We will use the scrbook class, so start your document with the following:

   \documentclass{scrbook}

2. Load the contour package. Specify the thickness of the contour and a number that stands for text copies internally used for overprinting.

   \usepackage{contour}
   \contourlength{1.5pt}
   \contournumber{25}

3. Define a macro for the new font style for our chapter:

   \newcommand{\chapterfont}[1]{%
   \contour{black}{\textcolor{yellow}{#1}}}

4. Apply the style that we just selected:

   \setkomafont{chapter...