http://0utpatient.home.comcast.net/noartifacts/
My son pointed out this format for saving image files..... I thought it was very interesting.
I think that article misses the point - JPEG was not designed for images with large areas of monotonous colour and sharp edges, it was designed for photographs. If you do need artefact-free (lossless) compression then there are better options for photos than PNG - lossless JPEG or lossless JPEG2000 for example.
S
