Hello Paul,

Is there a way to upload images (png) to the wiki?

Yes. You need to log in first, then select "Upload file" in the toolbox on the left hand side. Then choose a file and give it a sensible descripton. [General Disclaimer: Please only upload images to which you have sufficient rights to upload, I don't want to get into jail because of Copyright infringement]. Patrick -- ConTeXt wiki: http://contextgarden.net