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I am making a conference poster using a template provided in this link.
http://www.latextemplates.com/template/dreuw-deselaers-poster
I want to change the background color from gray to white and also, I want to reduce the size of the header area ( Title area). Please help me with this issue.
This is a summary of what already stated in the comments.
It can be changed with \setbeamercolor*{block body}{bg=<color>,fg=black} directly in the provided .sty file
It can be changed by substituting
\usebeamercolor{title in headline}{\color{fg}\textbf{\LARGE{\inserttitle}}\\[1ex]}
with
{\centering\usebeamercolor{title in headline}{\color{fg}\textbf{\LARGE{\inserttitle}}\\[1ex]}\par}
in the .sty file.
This will center only the title, authors and institute will stay right aligned. If everything needs to be centered it is necessary to replace the first occourrence of \raggedright with \centering into \begin{beamercolorbox}[wd=\paperwidth]{headline} (again it can be done directly in the provided .sty file)
\setbeamercolor{background canvas}{bg=white}, for the header area, its height depends on the content, so if you remove some content (authors, logo, ecc.) or reduce the font size it will shrink accordingly\setbeamercolor*{block body}{bg=white,fg=black}. You can change it directly into thebeamerthemeI6pd2.sty, the original version is\setbeamercolor*{block body}{bg=ta3aluminium,fg=black}file or reissue the command into the .tex file