Originally Posted by
this_is_gav
Print the picture out onto a high resolution inkjet photo printer and wait until completely dry. You'll need a pencil of around 0.25mm at this point, and a magnesium alloy (very important) ruler. With your weakest hand carefully line the ruler up so it's just above the edge of the photo/picture (ruler covering image) and with the other hand take up the pencil (or a equivalent graphical design pen, but not ink based as it will react with the ink on the paper and you'll end up with incestuous bleeding) and push firmly against the side of the ruler lined up with the print, almost scoring the paper if it's not easily torn. Blow off any residue with a class 14-17 pocket rocket, and leave to set for 2 hours (or 1 hour in a fridge).
Next you'll need a scanner - not any old scanner will do, but so long as you plan to buy from Dan the man at Scan your banners scanning will can come out fine. I suggest a PlotterMaster 1100dx. Set the resolution to 100% (or input the output resolution manually), keep the lid closed so that the greenoids don't escape and save in a location of your choice. Most PlotterMasters come with software to automatically upload to many image hosting services, so you may be able to miss the final step.
(This guide may be updated with pictures over time, but my PlotterMaster's greenoids did escape, so I'm waiting on Dan the other man who can at Scan to get back to me on a RMA.)