If the image is a copyright-protected work (and that is generally the case), then it may only be used with the consent of the author and the owner of rights. However, the image can be entered into the presentation as a ‘pictorial quotation’. Then it has to serve an explanatory, informational or illustrative function, be covered in the scope of the purpose of the quote, be disclosed as a quote and the source specified (Art. 25 para. 2 CopA).
