BI Publisher Desktop and use PNG image


Hi all,

i am using BI publisher Desktop Tool to design employee cards , i need to use the logo in the header of the cards where the color of the header will be changed depending on the pay grade of the employee , my problem is when i preview the cards in PDF format the logo that is in PNG format appears with a white background despite i test the logo and save a document from word to pdf and its appears with no white background like a want

please help me to know how to preview the png images with no white background when i export it to pdf format .

Thanks alot