Until recently, when lecturing, I showed Scala copy slides of my B&W fibre prints. With the demise of Scala and the increasing difficulty in finding optical slide projectors at out of town meetings, I must succumb to a digital solution.

I have access to an Epson 1000XL flatbed scanner and hence can scan 11 X 14" original prints. I can then insert the scanned files into a powerpoint slideshow for digital projection. I speak to groups of up to 450 people and hence the projected size will have to be BIG.

Given my lack of experience with digital scans, I have a simple question. What is the best file type (jpeg, pdf etc) to insert into a powepoint presentation, and at what resolution or file size should the prints be scanned?

I thank you in advance for helping me to make the leap...