Hi Usha,
If you have set the document view mode as PDF, then below is an associated issue and is fixed in BO 4.0 Sp4. If you are on Sp5 then fixes related to patches 4.4 and higher are missing, please check if this is the case.
ADAPT01635579
Description
When saving as PDF a Web Intelligence report containing charts, the charts on the PDF document are
blurred.
New Behavior
The problem has been resolved.
Limitations
Please provide more details on the issue as to what are the environment versions and whether issue is with rich client/launchpad or both and whether its consistent across all view modes (draft,PDF, page etc) and whether issue is consistent with all user ID's across different systems
Thanks
Mallik