CompuServe Messages

It's certainly possible for companies to make a stab at matching Adobe PostScript, but it isn't possible to guarantee a 100% match. After all, as Gary says, there are several things within the Adobe interpreters which are quite clever and are _not_ matchable exactly by their party authors (and, yes, there are some bugs in there too 🙂 Okay, they can make a stab at hinting or the fill algorithms, but they aren't going to perform _exactly_ as the Adobe interpreters. The Red Book is a description of how to program PostScript, it is not an expose of how the interpreter works, nor does it cover some of the special features built into PostScript. Red Book compliance is one thing, and several third party interpreters do a very good job and get almost 100% … but a lot of PostScript code (usually unwittingly) relies on some of the undocumented side effects and some of the special features of the Adobe interpreters. The problem of some PostScript implementations not fully matching the Adobe interpreters is leading, for instance, to some PostScript code that won't run on Adobe-validated interpreters and fonts which do not print correctly. Mike (Whapping from the UK)