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How to place EPS into a PS? 1

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tral

tral

Programmer
Oct 18, 2002
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I used the article of Mr.Thomas D. Greer "Preparing EPS files for use in VDP" to put an EPS file in my PS file like this
...
save
/showpage {} def
/setpagedevice /pop load def
0 0 translate
14.2 -12.848 scale
-154 -521 translate
(G:/Output/id_2_front.eps) run
restore
...
It works fine, but if I share my PS file the fixed path (G:/Output/id_2_front.eps) causes problems for the RIP.

Is it possible to put the EPS file inside the PS file like Form and how.
I was not able to find it in Acumen Journal.
Kind regards,
Trifon Alekov
 
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Hello,

Most of the time, you can simply copy the EPS into the PostScript where you want it. In effect, replace the "run" operator line in the code sample above with the entire EPS file.

This may not work with all EPS files. Also, if you are reusing the EPS multiples times within the PostScript, we need to discuss various approaches to that using the Form dictionary structure.



Thomas D. Greer
 
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Forum:

Trifon and I communicated via email, but I wanted to post a complete explanation of this technique for the benefit of anyone else who might be interested.

The goal is to embed an EPS file within a PostScript program so that no external references are necessary, and to only "RIP" the EPS data once so that it can be efficiently reused throughout your program.

PostScript provides the "Form Dictionary" structure for reusable content caching. The basic structure is as follows:

Code: 
/FormName
<< /FormType 1
   /BBox [0 0 612 792]
   /Matrix [1 0 0 1 0 0]
   /PaintProc
     { % some procedure to draw the &quot;form&quot;
     } bind
>> def

You've seen me use this structure with the &quot;run&quot; operator, to use an EPS file located in a locally accesible drive/folder. If we want to embed our EPS though, we can't just copy the EPS into the /PaintProc. This is because of the way PostScript tokenizes procedures. It will try to turn the contents of the EPS, including any image data, into valid PostScript tokens. When these get executed, you'll get errors, because binary or hex-encoded image data are not valid PostScript operators.

We have to use a little bit of misdirection.

The solution comes via the ReusableStreamDecode filter. Filters are used to create file objects from other file objects or strings. As the name implies, the filter object &quot;filters&quot; and/or encodes/decodes one file format into another.

The ReusableStreamDecode filter actually does no filtering at all, but it does have lots of uses which we can't go into here. But the key point is that it creates a File object. That file object can be used in our Form dictionary's PaintProc.

The Form Dictionary might look like this:

Code: 
/IDForm
<< /FormType 1
   /BBox [154 321 441 521]
   /Matrix [ 1 0 0 1 0 0]
   /PaintProc
   { pop
       /ostate save def
         /showpage {} def
         /setpagedevice /pop load def
         ImageData 0 setfileposition ImageData cvx exec
       ostate restore
   } bind 
>> def

Notice the BBox entry. Take that directly out of your EPS file. The PaintProc first does a pop, this is to remove the copy of the Form dictionary that gets put there as an artifact of how execform works. Next you see the standard &quot;EPS housekeeping&quot; statements.

The magic happens with &quot;ImageData 0 setfileposition ImageData cvx exec&quot;.

ImageData is a file we created with the ReusableStreamDecode filter. We first set it back to the start. Then we put the file on the stack, change it to executable with the cvx operator, and execute it.

To draw this logo or image, we simply perform &quot;IDForm execform&quot; wherever we want the EPS to draw. Precede that statement with appropriate save, scale, and translate operators, and of course match your save with a restore.

Great, but where does the &quot;ImageData&quot; file come from?

Copy the EPS in its entirety into the very top of your PostScript program. We'll precede it with code that uses the ReusableStreamDecode filter to turn it into a file:

Code: 
/ImageData
currentfile
<< /Filter /SubFileDecode
   /DecodeParms << /EODString (*EOD*) >>
>> /ReusableStreamDecode filter

Next would come our complete EPS. After the EPS code, complete the file definition with:

Code: 
*EOD*
def

Notice the &quot;*EOD*&quot;. This can be any string at all. We're telling the ReusableStreamDecode filter to stop when it encounters that string. Then the def, to associate the filtered file object with the /ImageData definition.

Here's a completed code segment:

Code: 
%!PS

/ImageData
currentfile
<< /Filter /SubFileDecode
   /DecodeParms << /EODString (*EOD*) >>
>> /ReusableStreamDecode filter
%% ommitted EPS, could be hundreds of lines!
*EOD*
def

/IDForm
<< /FormType 1
   /BBox [154 321 441 521]
   /Matrix [ 1 0 0 1 0 0]
   /PaintProc
   { pop
       /ostate save def
         /showpage {} def
         /setpagedevice /pop load def
         ImageData 0 setfileposition ImageData cvx exec
       ostate restore
   } bind 
>> def

And to use your EPS:

Code: 
save
  14.2  -12.848 scale
  -154 -521 translate
IDForm execform
restore

Apologies for being long-winded. If any of this was unclear, please send me your questions.



Thomas D. Greer
 
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Hi Tgreer,

I tried your code for putting an eps into a ps file, but it didn't work. did the code work for you? BTW are those '>>' signs part of the code? Is there any simple way to do the above?

Thank you.
 
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Yes, the code works. It's in use in lots of high-volume production code at multiple companies/sites.

The double-angle brackets are part of the code. They are a level-2 shorthand for defining a dictionary. (That's something to check; are you using a PostScript Level 2 device?)

First, does the EPS need to be actually inside the PostScript? Or would your workflow allow you refer to an EPS on the file system? For example, if you are processing your PostScript on a local system or server to produce a PDF file.

The simplest way to use an EPS is with the &quot;run&quot; operator. Barring that, you can copy the EPS into the code right where you need it to run, just be sure to protect your program as I explain here:
If you want to re-use the EPS multiple times, then follow the intructions in this thread. If you'd like, send me the program that you've written and I'll debug it.

Thomas D. Greer
 
Upvote 0 Downvote
Hi Tgreer,
thanks for your response. below is my ps code, I was unable to view it by GSview, also I sent it to our ps printer but nothing happened.
I appreciate your help
thank you,

below is the complete code with the eps in it:
----------------------------------------------
%!PS

/ImageData
pstest.ps
<< /Filter /SubFileDecode
/DecodeParms << /EODString (*EOD*) >>
>> /ReusableStreamDecode filter
%% ommitted EPS, could be hundreds of lines!
%!PS-Adobe-3.0 EPSF-3.0
%%Creator: EpsGraphics2D 0.3.1 by Paul Mutton, %%Title: barcode.eps
%%CreationDate: Thu Nov 06 11:00:39 PST 2003
%%DocumentData: Clean7Bit
%%BoundingBox: 8 -101 209 -54
%%DocumentProcessColors: Black
%%ColorUsage: Color
%%Origin: 8 -101
%%Pages: 1
%%Page: 1 1
%%EndComments

gsave
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0.0 0.0 0.0 setrgbcolor
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fill
newpath
/dialog findfont 12 scalefont setfont
0.0 0.0 0.0 setrgbcolor
grestore

%%EOF
*EOD* def

/IDForm
<< /FormType 1
/BBox [8 -101 209 -54]
/Matrix [ 1 0 0 1 0 0]
/PaintProc
{ pop
/ostate save def
/showpage {} def
/setpagedevice /pop load def
ImageData 0 setfileposition ImageData cvx exec
ostate restore
} bind
>> def

save
14.2 -12.848 scale
-154 -521 translate
IDForm execform
restore
 
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1) Near the top, change &quot;pstest.ps&quot; to &quot;currentfile&quot;.

2) Remove &quot;%% ommitted EPS, could be hundreds of lines!&quot;

3) At the very end, you need to scale and translate appropriate to your specific image. For example, since your bounding box starts the image 8 points left and 101 points down, you might want to reverse that with your translate: -8 101 translate.

4) End your program with &quot;showpage&quot;.

Thomas D. Greer
 
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Tgreer,
Thanks for your response. I did all those changes but it still doesn't work. Could you view/print the page?

here are the changes that I made:

pstest.ps -> currentfile
removed %% ommitted...
ended the program with:
save
1 1 scale
-8 101 translate
IDForm execform
restore
showpage
 
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Yes, it showed a barcode at the bottom of the page. Can you email me the file? Don't post it in the forum, it takes too much space. You can find my email address on my website.



Thomas D. Greer
 
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