BIRT 4.3.2 - embedded background image is not appearing in pdf report

My requirement is to add text over image for both HTML and PDF reports. I have achieved this by for HTML report, but unsuccessful for pdf report. Please help.

I did the below and its working for HTML report

1. Create a grid with one row-->cell add background image(URI based)

2. Inserted a grid of one row-->cell on the previous cell(Step 1) and add text element

Background image is appearing on the HTML report.

I did the below for PDF report.

1. Create a grid with one row-->cell add background image(embed)
2. Inserted a grid of one row-->cell on the previous cell(Step 1) and add text element

Background image is NOT appearing on the PDF report. Please help.

Thanks, Veera