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Re: Postscript dump to a Laserwriter [message #633 is a reply to message #632]

Fri, 18 December 1992 13:30

thompson
Messages: 584
Registered: August 1991

Senior Member

In article <1992Dec18.174615.4416@ennews.eas.asu.edu>, scowen@wfpc3.la.asu.edu (Paul A. Scowen) writes...
> In article <18DEC199211000500@stars.gsfc.nasa.gov>, thompson@stars.gsfc.nasa.gov (William Thompson, code 682.1, x2040) writes:
>
> |> I don't understand this part. I have trouble seeing how the internal commands
> |> like CONTOUR, TVRD, TVLCT, etc. can affect the values stored in the COLORS
> |> common block.
>
> Well, so do I - but try it. It does exactly that - completely forgetting the
> stretch you've set.

I guess I still don't know what you mean exactly. Does it change the arrays
stored in the common block, or does it just change the color tables on the
display? Could you give me a concrete example?

>
> |> >1. Given a color strectched image with contours overlaid, how can I produce
> |> >*either* color or laserwriter PS from a tvrd() call (ignoring the screen-
> |> >dump bugaboo)?
> |>
> |> You can do a dump of a window with exactly the same colors that appear on the
> |> screen by using TVLCT,/GET to get the current (stretched) color table. For
> |> example,
> |>
> |> IMAGE = TVRD(0,0,!D.X_SIZE,!D.Y_SIZE)
> |> TVLCT,RED,GREEN,BLUE,/GET
> |> SET_PLOT,'PS'
> |> TV, IMAGE !Note: Not TVSCL
> |> TVLCT,RED,GREEN,BLUE
> |> SET_PLOT,'X'
>
> Unfortunately, Bill, this does *not* work. I've just tried it several times,
> with several different stretches, and the resulting PS file looks execatly
> the same for all versions. It uses the default setting of b/w linear in the
> 4bit mode, which is of no use to me. This is my whole point.

This may be because I left out the following command:

DEVICE,/COLOR,BITS_PER_PIXEL=8

which is crucial. Sorry about that. (I also forgot the DEVICE,/CLOSE at the
end.)

(remainder of previous message deleted).

Bill Thompson

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[Message index]

		Re: Postscript dump to a Laserwriter By: scowen on Sun, 20 December 1992 13:55
		Re: Postscript dump to a Laserwriter By: scowen on Fri, 18 December 1992 09:46
		Re: Postscript dump to a Laserwriter By: thompson on Fri, 18 December 1992 13:30
		Re: Postscript dump to a Laserwriter By: thompson on Fri, 18 December 1992 07:00
		Re: Postscript dump to a Laserwriter By: scowen on Fri, 18 December 1992 12:16
		Re: Postscript dump to a Laserwriter By: thompson on Fri, 18 December 1992 10:00

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