New issue 258: Tracing Mode https://bitbucket.org/valentinateam/valentina/issue/258/tracing-mode
Robert Martin:
Given that a number of free/open patterns are in PDF or JPG format i was thinking that it might be an idea to have some sort of mode where the valentina window is partly transparent so that you can trace an existing pattern. im not sure if making the whole background or just the piece editor would be cleaner (the second would require adding a PDF/JPG loader).