I removed the background of a graphic in Photoshop and saw the familiar checkerboard. I exported it as a png. I opened the png up in an image viewer and the background was indeed transparent. Brought the file into my InDesign project and it looks transparent on the screen. Exported as a pdf from InDesign. Opened pdf in an image viewer and it all looks good. Printed the pdf and there is a slight grey tint to the background, but it's so noticeable! I've done this lots before and never had a similar problem and not sure what I've done wrong this time.
Why not save it as a PSD?
Beyond that we need full details. Version of ID, PDF settings, what PDF viewer?
It honestly hadn't occurred to me, Bob. I'll give it a try and see if that fixes the printing when I get to work tomorrow. Thanks for the "duh" suggestion, which I seem to need fairly often when it comes to tech stuff!