Oracle Database Discussions

Hi
I am using oracle 9i database
I have written a package using 'utl_smtp' package to send email and attachment.
When I am attaching a oracle report (in .pdf format;This report has an Image inserted into it) and sent it to an email address, the attachment is sent properly. But when I am opening the attached file it is giving me
insufficient data for an image instead of showing the picture. After the picture rest all text part of the report is appearing properly.

The image is 24-bit bmp file.
To test I have created another .bmp file with smaller size. And in that case it is working fine.

Could you please resolve the problem.

Regards