blank rasterdata

[Ganesh]

Hi,

My cups driver prints only the .PS files.
If i try to print other formats , its blank.
I saw the raster data in the rasterview , nothing is displayed except the bounding box white background.
If I print the .PS files then I can see print.
Where I am doing wrong ? Can you please suggest ?
My filter program in the ppd is as follows.

*cupsFilter: "application/vnd.cups-raster 50 /usr/lib/cups/filter/rastertocard"

Regards
Ganesh