> Dear all....I've to convert a pdf file having multi color background to 
> Black and white to get a legible copy when printed.I'm using Debian 
> Gnu/Linux 5.0.4.Thanks in Advance.
> 

I don't understand your intension exactly.

Try these options

1. Use nconvert

Download: http://download2.xnview.com/NConvert-x86-unknown-linux2.x.tgz
$nconvert -binary nodither -keepcspace -colors 2 -out pdf -c 4 -o output.pdf 
input.pdf

nconvert is not GNU/GPL, I think.

2. $gs -sOutputFile=output.pdf -sDEVICE=pdfwrite -sColorConversionStrategy=Gray 
-dProcessColorModel\=/DeviceGray -dCompatibilityLevel=1.4 input.pdf < /dev/null

Jos Collin

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