Reusable stream with ASCII85Decode and DCTDecode

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6 total messages Started by Tony Lima Wed, 30 Jul 2003 18:31

#919

Author: Tony Lima
Date: Wed, 30 Jul 2003 18:31

20 lines
1756 bytes

Hello, this is my first post here. I am new to PS programming and need some help with this filter. Namely, to figure out how to use both the ASCII85Decode and DCTDecode filters with the ReusableStreamDecode filter. Here's part of my script:

%!PS-Adobe-3.0
%%Creator: TJL
%%Title: sauce_25
%%CreationDate: ()
%%LanguageLevel: 3

/TemplateData currentfile
<< /Filter [ /ASCII85Decode /DCTDecode ]
   /DecodeParms [ null << >> ] >> /ReusableStreamDecode filter
s4IA0!" <...lots of ASCII85 JPEG data...> ~>
%%EOF
def

Just sending this to a PS L3 printer generates a Postscript Error. Removing the /DecodeParms because these filters do not require params makes no difference. If I remove the /DCTDecode filter and params, it is received ok, but "image" fails to image it properly since it is still compressed. My goal is to reuse this stream on multiple pages without having to decompress it each time.

Any help would be appreciated...thx

-Tony Lima

Re: Reusable stream with ASCII85Decode and DCTDecode

#923

Author: Helge Blischke
Date: Fri, 01 Aug 2003 13:32

3 lines
969 bytes

Your code looks OK with respect to the PLRM.

Try feeding your data into distiller or Ghostscript (as a reference implementation); I have found a couple of quirks in "real" PS printers with respect to combination of filters.

Re: Reusable stream with ASCII85Decode and DCTDecode

#925

Author: Tony Lima
Date: Fri, 01 Aug 2003 14:54

5 lines
882 bytes

Thanks Helge,

I just ran this thru Ghostscript with no problems.

Any idea what would be the course to take in a situation like this?

Re: Reusable stream with ASCII85Decode and DCTDecode

#927

Author: Helge Blischke
Date: Sat, 02 Aug 2003 12:14

1 lines
898 bytes

What is the PostScript error message you get, and what printer do you use?

Re: Reusable stream with ASCII85Decode and DCTDecode

#929

Author: Tony Lima
Date: Mon, 04 Aug 2003 11:52

8 lines
1043 bytes

I am using an OKIData C7300.

I don't know (yet) how to extract the specific PostScript error. The printer itself just displays "Postscript Error".
I'll look into this.

I may also try to create another reusable stream from the JPEG compressed one.

Thanks.

Re: Reusable stream with ASCII85Decode and DCTDecode

#940

Author: Tony Lima
Date: Thu, 14 Aug 2003 13:00

3 lines
916 bytes

Update. Switching to a different printer (Lexmark) resolved this issue.

I will pursue this on the OKI when time permits. Might need a firmware upgrade or something.

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