使用Interop时未显示的图像。将Excel转换为PDF

I'm using Interop.Excel to convert excel (xlsx)(2010) to PDF for an application. On my development machine it works fine and the images are displayed correctly. However on the server when the excel is converted to PDF the images (some inserted via code and others in the template document) are not displayed in the PDF. The excel file is fine when viewed. Here is my code I use to convert to PDF:I'm using Interop.Excel to convert excel (xlsx)