You don’t Adobe does. I would guess if their was enough call for it they would. Since they haven’t maybe their isn’t.
Not all flavors of a file format are supported. TIFF is a good example, there are dozens of flavors if TIFF that Adobe and others just don’t support.
It would be interesting to hear what Adobe has to say about the lossless JPG though. Maybe there is a good reason they don’t beyond that fact that it may or may not have been asked for.
Robert
Not all flavors of a file format are supported. TIFF is a good example, there are dozens of flavors if TIFF that Adobe and others just don’t support.
Interesting example since Adobe became the defacto shepard of the Tiff specification when they acquired Aldus. I think the issue is more down the path of "to what extent to features in a format change before they are added to the specificaion?"
If it’s not part of the official specification, I don’t know that supporting a specific feature is worthwhile – at least until such time as that feature does become part of the spec.
Hmm, there hasn’t been much call for Lossless JPEG support. And it’s not commonly supported by other applicaitions.
But if there is enough demand, I think we could add it (pending legal review, etc.).
And there are some problem areas in the TIFF specification, or abuses of it, that we just cannot support. Also, there are lots of vendor specific varieties (and abuses) of TIFF that we can’t support, or don’t get enough requests to support.
The TIFF spec is virtually endlessly extensible, so it’s unlikely any image editing program will incorporate compatibility with all extensions. An image viewing program, perhaps.
