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Optimized postscript specification

New Here ,
May 27, 2008

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I need to convert normal postscript to "optimized postscript" so RIP times on a full color printer, like iGEN, don't take 30 minutes to process a 2500 pages file filled recurring images.
what i know so far is that "optimized postscript" is standard postscript written in a certain way. It is more that punting images on the header.

Anyone knows where to get the specification?
An application that do this transformation would be marvelous!

Regards
Carlos

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Optimized postscript specification

New Here ,
May 27, 2008

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I need to convert normal postscript to "optimized postscript" so RIP times on a full color printer, like iGEN, don't take 30 minutes to process a 2500 pages file filled recurring images.
what i know so far is that "optimized postscript" is standard postscript written in a certain way. It is more that punting images on the header.

Anyone knows where to get the specification?
An application that do this transformation would be marvelous!

Regards
Carlos

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Programming

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2.2K

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Explorer ,
May 27, 2008

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There is no specification. This is not a formal term.

Aandi Inston

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Contributor ,
May 28, 2008

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"Optimized PostScript" usually means guide lines for generating PostScript jobs that may speed up the RIPing process by various means which may be highly RIP-vendor dependent, such as:

- specifying images used repeatedly as PostScript forms,

- downloading images used repeatedly prior to the job and RIPing them
separately, then linking the pre-ripped images to the job

- using subsetted fonts

and many more such tricks.

I'd suggest to ask - in your case - the Xerox people for optimizing recommendations and/or software. Note that it depends on the controller software you are using for your iGEN.

Helge

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New Here ,
May 30, 2008

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Seems to be the only way. Our primer Xerox contact says its public, but i can't find those guide lines anyware in the net.
Tanks

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Adobe Employee ,
May 30, 2008

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On behalf of Adobe Systems Incorporated, let me advise that there is no such thing as an official "optimized PostScript specification." There are some vendors who have hacked around with various PostScript interpreter implementations to specially handle certain PostScript constructs in their own environment, but these protocols are certainly not universal!

- Dov
- Dov Isaacs, Principal Scientist, Adobe

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New Here ,
Jun 16, 2008

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Tks Isaacs,
"Optimized postscript" his mencioned in some some VDP tools, like print shop mail. After your statment i guess it means only eficiente reuse of resources.

But still something is wrong that causes Xerox DocuSP Controller to process the same image several times.
Maybe is the way the image is called.

Here is a sample:

/@GP
{
save exch mark exch
execform
cleartomark restore
} bd

/@CForm {
10 dict begin
/EPSArray exch array def
/BBox exch def
/FormType 1 def
/AcquisitionProc {
EPSArray dup 0 get dup 0 get % array counter_array counter
dup 3 1 roll % array counter counter_array counter
1 add 0 exch put % increment counter
get % use old counter as index into array, placing
% next string on operand stack.
} bind def

/PaintProc {
begin
EPSArray 0 get 0 1 put
/AcquisitionProc load 0 () /SubFileDecode filter
cvx exec
end % form dict
} bind def

/Matrix [1 0 0 1 0 0] def
currentdict end def
} bind def

The EPS image:

/@G1 [0.00 0.00 522.72 233.04] 27 @CForm
/inputFile currentfile 0 (% EOD_Marker_002) /SubFileDecode filter def
@G1 /EPSArray get
@ReadData
@GB
%!PS-Adobe-2.0 EPSF-1.2
%%Creator: Transfrm JPG
%%Title: PORSCHE

Finaly calling the image:

gsave 28.35 -516.54 translate @G1 @GP grestore

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