Compressed TIFFs and Postscript

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2 total messages Started by Jeff Wasilko Wed, 30 Dec 1992 02:52

#5858

Author: Jeff Wasilko
Date: Wed, 30 Dec 1992 02:52

24 lines
1435 bytes

How are LZW-compressed TIFFs handled in Postscript (I'm thinking of
a compressed TIFF placed in a Quark XPress document)?

How is the image uncompressed? Is the decompression routine included
in the postscript, or can the PS interpreter deal with the compressed
image directly? How fast will the decompression run on a Linotype
RIP 4 (a 68020)?

I'm wondering if the savings in disk storage and transfer time (the
RIP 4 is on LocalTalk) will be lost in decompression time at the
RIP?

Thanks,

Jeff

--
Jeff's Oasis at Home.                   Jeff can also be reached at work at:
(Remember: The Secret Service is Neither.)              jwasilko@airage.com
"A system admin's life is a sorry one.  The only advantage he has over
Emergency Room doctors is that malpractice suits are rare.  On the other
hand, ER doctors never have to deal with patients installing new versions
of their own innards!"  -Michael O'Brien

Re: Compressed TIFFs and Postscript

#5864

Author: Manuel Veloso
Date: Wed, 30 Dec 1992 19:35

21 lines
1588 bytes

In article <0105002B.mcu7to@digtype.airage.com> Jeff Wasilko,
Jeff@digtype.airage.com writes:
>How are LZW-compressed TIFFs handled in Postscript (I'm thinking of
>a compressed TIFF placed in a Quark XPress document)?
>
>How is the image uncompressed? Is the decompression routine included
>in the postscript, or can the PS interpreter deal with the compressed
>image directly? How fast will the decompression run on a Linotype
>RIP 4 (a 68020)?

For level 1, the TIFF is uncompressed by XPress (then clipped & 
re-rezzed, btw) and send. Level 2 can decompress them, but I'm not sure 
if Quark does that yet.

>I'm wondering if the savings in disk storage and transfer time (the
>RIP 4 is on LocalTalk) will be lost in decompression time at the
>RIP?

Yes, assuming it uses level 2 for decompression, no if it doesn't.

Manuel

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