Canvas and Postscript

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3 total messages Started by Leif Jensen-Pistorius Tue, 10 Nov 1992 14:10

#4030

Author: Leif Jensen-Pistorius
Date: Tue, 10 Nov 1992 14:10

12 lines
732 bytes

Hello,
I am often read (eg. in the FAQ of this group), that I can preview Postscript
Files with Canvas. I have Canvas 3.0.3 (German) and if I try to do this I
get only a box without the possibilty to view or edit the Postscript.
In the Handbook I found no Information.

If you have a solution, please e-mail direct:

jensen@sap-ag.de

Thanks
Leif Jensen-Pistorius

Converting X color (24 bits color) image to postscript.

#4034

Author: Latendresse Mario
Date: Tue, 10 Nov 1992 19:49

8 lines
712 bytes

I have been looking around to find a program to convert
images, dumped by the xwd program from a 24 bits color
display, into PostScript (Level 2).

Anybody knows such a program and where I could get it?

Mario

Re: Converting X color (24 bits color) image to postscript.

#5675

Author: Chris Lilley
Date: Thu, 12 Nov 1992 21:45

41 lines
2188 bytes

In article <1992Nov10.194925.15996@cc.umontreal.ca> latendrm@ERE.UMontreal.CA (Latendresse Mario) writes:

>I have been looking around to find a program to convert
>images, dumped by the xwd program from a 24 bits color
>display, into PostScript (Level 2).

Well converting it to a PS file that *prints* on a level 2 printer is
one thing. Finding a program that *uses* the level 2 features is
another. Were you thinking of the compression or the device
independent colour aspects of Level 2?

Anyway, to make your file try:

xwd -nobdrs | xwdtopnm | pnmtops > file.ps (or pipe straight to your
printer)

You may want to remove gamma correction from your ppm image before
conversion to PS (printers don't need gamma correction).

Note that this process uses the simple minded (1-R)(1-G)(1-B) formula
so the colours will be quite different in print from the screen.

If you want to use the Level 2 image operator and set up a calibrated
RGB space you will need to know the RGB and white chromaticities of
your monitor, and its gamma. 

Has anyone written a program that takes a ppm file and this info and
generates a Level 2 PostScript representation like this? I understand
what it has to do, but wouldn't call myself a programmer.

--
Chris Lilley
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Technical Author, ITTI Computer Graphics and Visualisation Training Project
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Internet:   lilley@cgu.mcc.ac.uk        Janet:   lilley@uk.ac.mcc.cgu
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