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    <font face="Myriad Pro">Hi Saravanan,</font><br>
    <br>
    using your code below<br>
    <blockquote
      cite="mid:AANLkTimwyAcBuMU++R+D5k2tSmMYwm1NJ0WCEAVZjnmA@mail.gmail.com"
      type="cite"><br>
      \begin{picture}(0,0)\put(-129,
      <div id=":150">-670){\psframebox[linewidth=0pt,linecolor=white,fillstyle=gradient,gradbegin=black!12,gradend=white,gradmidpoint=-.90,framearc=0]{\hbox

        to 192mm{\vbox to 250mm{}}}}\end{picture}}<br>
      </div>
    </blockquote>
    <blockquote
      cite="mid:AANLkTimwyAcBuMU++R+D5k2tSmMYwm1NJ0WCEAVZjnmA@mail.gmail.com"
      type="cite">
      <div id=":150">I am using dvips to convert .dvi to .ps file and
        using Acrobat to convert PS to PDF. In Pitstop says "Document
        uses 3 separations, should be less than equal to 0 (1x)", but I
        used </div>
    </blockquote>
    <blockquote
      cite="mid:AANLkTimwyAcBuMU++R+D5k2tSmMYwm1NJ0WCEAVZjnmA@mail.gmail.com"
      type="cite">
      <div id=":150">only black no other color.<br>
      </div>
    </blockquote>
    didn't give any errors on my side distilling it to the PDF. However
    the result is a white paper.<br>
    <br>
    Try out the following code which gives a fine gradient such as
    wanted i guess.<br>
    <br>
    \documentclass{article}<br>
    \usepackage[distiller]{pstricks}<br>
    \usepackage{pst-grad}<br>
    \begin{document}<br>
    \begin{pspicture}(0,0)(10,10)<br>
\psframe[linewidth=0pt,linecolor=white,fillstyle=gradient,gradbegin=black,gradend=white,gradmidpoint=-.90,framearc=0](0,0)(10,10)<br>
    \end{pspicture}<br>
    \end{document}<br>
    <br>
    Hope this helps,<br>
    <br>
    Juergen<br>
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