Interestingly the entire NextStep UI was built on a graphics format called Display Postscript when Apple acquired it as the foundation of OS X
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The other thing that Apple did while developing OSX was to replace Display PostScript with an in-house implementation of Adobe's open PDF specification.
Beacuse Apple and Adobe could not agree on licensing costs.
I think it had just as much to do with adding a better compositing layer. That was when suddenly the GUI had a third dimension.
an idea that NeXT copied from Sun Microsystems NeWS
Is there a citation for that? I thought Adobe built this with NeXT separately but clearly Adobe would know of NeWS too.
Here's a comment from 2016 that quotes technical discussions from 1988. It is clear that the Display Postscript implementers had detailed knowledge of NeWS.
"In a few cases they picked the same names and operator spec as us, but in general they didn't try to be compatible. A few incompatibilities seem gratuitious to me."
That’s interesting; thanks.