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Re: 8-bit Postscript problem (Will IDL and color Postscript *ever* get along?) [message #49260 is a reply to message #49210]

Tue, 11 July 2006 11:07

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

M-K writes:

> Oddly, doing
> set_plot, 'ps' & !P.Font=0
> DEVICE, BITS_PER_PIXEL=8, COLOR=1, FILE=fnam, $
> /ENCAPS, XSIZE=7,YSIZE=4,/INCHES
> Help,/DEVICE
>
> confirms 8 bits per pixel; the output is:
>
> Current graphics device: PS
> Mode: Portrait, Encapsulated, EPSI Preview Disabled, Color Enabled
> Output Color Model: RGB
> ... { offset, size, preview stuff here, Scale Factor is 1 }
> ...
> Font: Helvetica TrueType Font: <default>
> # bits per image pixel: 8
> Font Mapping: ...
>
> So somehow the colorbar output is nice, but the TVImage output
> is pixelly or not enough colors, despite BITS_PER_PIXEL=8.
> Could there be a pixel scaling problem with Postscript?

If there is, it would be the first time I've ever heard of it.
I'll be honest, I am completely mystified. I guess the only
thing to try now is prayer, with maybe a histogram plot of
the data you are trying to display as an image to see if
there is something wrong there. But it looks to me like you are
doing all the right things. Strange... PostScript is always
ultra reliable. :-)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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		8-bit Postscript problem (Will IDL and color Postscript ever get along?) By: brac00_at_PsU_dot_EdU on Thu, 06 July 2006 14:51
		Re: 8-bit Postscript problem (Will IDL and color Postscript ever get along?) By: David Fanning on Tue, 11 July 2006 11:07

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