I'm looking for a wiki with the follow features:

• simple WYSIWYG editor (actually, it'd be perfect if the WYSIWYG editor is the default way to view a page)
• I need to upload a lot of heavy images, so every time I add an image the wiki should create a compressed version of the image (the compressed version is the displayed in the page, but this compressed image it is linked somewhat to the original one)
• autocompletion for locals links

Note that it does not matter whether it is a desktop app or web-based, monouser or multiuser.