I have a problematic about Pixelmator: I create diagram on the software AutoCAD, I export it in PDF then I open it in Pixelmator. When I open it the background is removed wihtout asking anything, which is perfect because I need that to put it on a website.
But I don't know why it did that, some of my collegues need to do that but I can't find how to do on Windows with others softwares (GIMP, Photofiltre, etc.). Any ideas about it?
Link of an example of the PDF that I create with AutoCAD and then open in Pixelmator to remove the background :
Chat about the original Pixelmator.