To get back to the original state of an image in an RWH collection at fotopic:

• Assuming you are looking at a page in a collection for one image, eg. this one
• check the image properties (usually via a right click on the image) and get its name: http://newimages.fotopic.net/?iid=yixhr3&outx=800&quality=70 or
• click on the image, go to the "noresize" version and note the URL
• in both cases, look for the "iid=" which is followed by a six character image id, in this case yixhr3
• use this id to fetch images.fotopic.net/original/<imageid>.jpg

See also these notes.