问题
I use ITextSharp to print a PDF document. I put a logo (logo of Microsoft as example) on document and it is described perfectly in PDF file.
But after printing this PDF, I get gray dots accross logo on paper.
I use a PNG image with transparent background, and my logo is in high resolution as Microsoft logo. Please help how I can solve this issue?
来源：https://stackoverflow.com/questions/23077256/itextsharp-image-issue-in-pdf-after-printing