We did a similar format, to allow editable "JPEGs." The IFD of a JFIF container was normal, except that we added a second entry, with the raw source of the imag

We did a similar format, to allow editable "JPEGs." The IFD of a JFIF container was normal, except that we added a second entry, with the raw source of the image. Traditional readers saw a JPEG (although an unusually obese one), but our software could access the second entry, which contained the raw source, and the control parameters for all the processing steps that resulted in the JPEG, so we could treat the image as nondestructive, and reversible. It was never actually released, if I remember, but it may well be patented. TIFF was originally designed to store drum scanner data, in realtime, so it uses strips, as opposed to tiles.