Color Postscript Question

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3 total messages Started by Fogbound Child Mon, 14 Sep 1992 18:06

#1945

Author: Fogbound Child
Date: Mon, 14 Sep 1992 18:06

25 lines
1611 bytes

Forgive me if this is a FAQ or related to one. I wasn't able to find
a reference anywhere.

I've got this 1024 x 864 screen dump that I'm converting into color
Postscript. I've been successful in translating it into a printable file.

The problem arises in that there are only about 12 colors in the screen
image, so I'm creating a five Meg file when I could actually be creating
a much smaller file. I'm sure that the processing and printing would be
significantly faster if I could use four bits/pixel.

So is there some easy way to do "paletted" or mapped color? I've been
unsuccessful using single-nybble color in the image map, but maybe that's
a result of not knowing the right way to do it. Alternatively, is there
some way to get around the ascii expansion of the bitmap?

The target printer is a Tektronics Phaser III that supports Postscript
Level II.

Thanks!
-- 
_________Pratice Safe .Signature! Prevent Dangerous Signature Virii!_______
Guildenstern: Our names shouted in a certain dawn ... a message ... a
              summons ... There must have been a moment, at the beginning,
              where we could have said -- no. But somehow we missed it.

Re: Color Postscript Question

#1954

Author: Andrew Klossner
Date: Tue, 15 Sep 1992 18:15

17 lines
1155 bytes

[]

	"The problem arises in that there are only about 12 colors in
	the screen image, so I'm creating a five Meg file when I could
	actually be creating a much smaller file ... The target printer
	is a Tektronics Phaser III that supports Postscript Level II."

The datasrc input to the "image" operator can be an arbitrary
PostScript procedure.  You could write a procedure which reads paletted
color, translates to the desired values, and hands them off.

Since it's level II, you could also compress the whole file.  See
section 3.13 of the PostScript Language Reference Manual, second
edition.

  -=- Andrew Klossner  (andrew@frip.wv.tek.com)
                       (uunet!tektronix!frip.WV.TEK!andrew)

Re: Color Postscript Question

#1955

Author: Kevin Draz
Date: Tue, 15 Sep 1992 20:26

20 lines
1149 bytes

In article <192kbmINNlng@phakt.usc.edu> sgoldste@usc.edu (Fogbound Child) writes:
>Forgive me if this is a FAQ or related to one. I wasn't able to find
>a reference anywhere.
>
>I've got this 1024 x 864 screen dump that I'm converting into color
>Postscript. I've been successful in translating it into a printable file.

send mail to:

"color_printer_info@leda.wv.tek.com" with the line "send index" in the
body.  You'll see an X-Window dump to PS level-2 filter.  If you are only
using 12 colors, the indexed colorspace option with run-length or LZW
compression should squeeze that file down to a very compact size.

KD

-- 
----
kevind@pogo.wv.tek.com  | For most software publishers, quality is job 1.01.
Tektronix Color Printers|                            -- MacWeek Magazine

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