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Re: switching PS device from color to b/w? [message #31256 is a reply to message #31255]

Wed, 26 June 2002 08:06

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Ken Mankoff (mankoff@I.HATE.SPAM.cs.colorado.edu) writes:

> What is the difference between:
>
> DEVICE, color=0
> and
> DEVICE, /color, bits_per_pixel=1
>
> Which is more appropriate? Is the only difference for those people who
> argue about black being a color vs. the lack of all colors?

DEVICE, COLOR=0 turns PostScript color output off. BITS_PER_PIXEL=1
simply stores 1 bit per image pixel in the file every time you
do a TV command. It probably stores the lowest bit, so I imagine
an image would look pretty strange.

With color turned off, however, you can only get black
and white output. If you want gray-scale output, you
have to turn COLOR on and load a gray-scale color table.

And, remember, in PostScript you can have any color background
you want, as long as it is white. But that is a discussion
for another day. :-)

Cheers,

David

P.S. All this PostScript stuff is pretty much taken care
of automatically if you use something like PSCONFIG to
set up your PostScript device:

http://www.dfanning.com/programs/psconfig.zip

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: switching PS device from color to b/w? By: David Fanning on Wed, 26 June 2002 10:00
		Re: switching PS device from color to b/w? By: Liam E. Gumley on Wed, 26 June 2002 09:02
		Re: switching PS device from color to b/w? By: David Fanning on Wed, 26 June 2002 08:10
		Re: switching PS device from color to b/w? By: David Fanning on Wed, 26 June 2002 08:06
		Re: switching PS device from color to b/w? By: nobody@nowhere.com (S on Mon, 24 June 2002 10:19
		Re: switching PS device from color to b/w? By: Ken Mankoff on Mon, 24 June 2002 09:24
		Re: switching PS device from color to b/w? By: nobody@nowhere.com (S on Mon, 24 June 2002 09:16
		Re: switching PS device from color to b/w? By: David Fanning on Sun, 23 June 2002 22:37
		Re: switching PS device from color to b/w? By: condor on Tue, 09 July 2002 17:03

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