[texhax] space between colorboxes in adjacent lines

Axel Freyn axel-freyn at gmx.de
Tue Apr 27 17:24:51 CEST 2010

Hi José
On Tue, Apr 27, 2010 at 11:14:34AM -0300, José Romildo Malaquias wrote:
> I want to set the background color of a set of consecutive lines. I am
> using the \colorbox command from the color LaTeX package. 
>   \documentclass[a5paper]{article}
>   \usepackage{color}
>   \newcommand{\cbox}[2]{%
>     \colorbox{#1}{\makebox[\linewidth][l]{#2}}}
>   \begin{document}
>   \noindent
>   \cbox{yellow}{First~line}\newline
>   \cbox{yellow}{Second line}\newline
>   \cbox{yellow}{}\newline
>   \cbox{yellow}{Fourth line}
>   \end{document}
> The result of running pdflatex with this document is attached.
> The problem I want to solve is the small blank space between each
> line. How can it be eliminated?
The easiest (and less cleanest;-)) is probably to do it "by hand", by
replacing "\newline" by "\\[-1pt]" (this reduces the linespacing by
1pt - than it works correctly, except for the empty line, where the
colorbox is not high enough. To correct that, you could write
in order to guarantee that the box has the necessary height:

  \cbox{yellow}{Second line}\\[-1pt]
  \cbox{yellow}{Fourth line}

works for me. Of course, you could include the "\\[-1pt]" as last
element into your \cbox-command.

However, you will have a problem when there are paragraphs in the text:
there, LaTeX adds an additional vertical space (\parskip) - you will
have to treat that separately when it appears in your text?


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