Please describe the problem:
While making a scientific poster evince showed annoying stripes in color gradients. xpdf (version 3.01) and acrobat render the document correctly.

Steps to reproduce:
It should be possible to reproduce the bug by compiling following file with pdflatex.

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{color}
\usepackage{tikz}
\usepackage[a0paper,margin=2cm,nohead,nofoot,paperheight=110cm, paperwidth=95cm]{geometry}

\definecolor{botcol}{rgb}{0.890625, 0.88671875, 0.99609375}
\definecolor{topcol}{rgb}{1.0, 1.0, 1.}

\pagestyle{empty}
\pagecolor{black}



\begin{document}

\begin{tikzpicture}
\draw (0,0) node[shade, color=topcol, bottom color=botcol] {
\parbox{1.\textwidth}{
\Large Test
\vspace{30cm}
}};
\end{tikzpicture}

\end{document}


Actual results:


Expected results:


Does this happen every time?


Other information: