MacArthur, Ian (SELEX GALILEO, UK) wrote:
> Does level-3 function as a superset of level-2? By which I mean, is it a
> valid assumption that a printer that understands level-3 will understand
> level-2 also?
Some details here:
http://en.wikipedia.org/wiki/PostScript
PostScript Level 2 was introduced in 1991, and included several improvements:
improved speed and reliability, support for in-RIP separations, image
decompression
(for example, JPEG images could be rendered by a PostScript program), support
for
composite fonts, and the form mechanism for caching reusable content.
PostScript 3 (Adobe dropped the "level" terminology in favor of simple
versioning)
came at the end of 1997, and along with many new dictionary-based versions of
older
operators, introduced better color handling, and new filters (which allow
in-program
compression/decompression, program chunking, and advanced error-handling).
PostScript 3 was significant in terms of replacing the existing proprietary
color
electronic prepress systems, then widely used for magazine production, through
the
introduction of smooth shading operations with up to 4096 shades of grey
(rather than
the 256 available in PostScript 2), as well as DeviceN, a color space that
allowed the
addition of additional ink colors (called spot colors) into composite color
pages.
There's a good top level document written in 2006
that covers some "how to's" (referenced from the above wikipedia page):
http://www.tailrecursive.org/postscript/postscript.html
..which describes among other things, color space:
http://www.tailrecursive.org/postscript/color.html
.. and raster graphics:
http://www.tailrecursive.org/postscript/image.html
I've used that same raster technique in perl scripts to generate invoices
and quotes to include logos and such; works pretty well.
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