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Re: IDL Colorbar generation question [message #49220 is a reply to message #49146]

Thu, 06 July 2006 09:16

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

britneys@ucla.edu writes:

> I do use direct graphics, whoops on the graphics object! This is how
> the window is called:
>
> SET_PLOT,PLATFORM
> !P.FONT=0
> DEVICE,DECOMPOSE=0,RETAIN=2
> !P.BACKGROUND=255 ;background color=white
> WINDOWCOUNT=0
> WINDOW,WINDOWCOUNT,xsize=XWIND,ysize=YWIND,title=VERSION
> ERASE
>
> Okay, so back to your colorbar routine, it will automatically use my
> self-defined color table? I used the following call:
>
> colorbar = Obj_New("COLORBAR", Range=[0,1000], Format='(I4)', $
> Title='Values')
> colorbar->SetProperty, Position=[0.1, 0.75, 0.9, 0.80], /Draw
> colorbar->Draw
>
> is this correct?

Yes, assuming you have loaded a 256-color color table before
this call, this will work perfectly.

> Also, when i output the file to a ps, the colorbar,
> instead of being a smooth color transition ends up as several boxes of
> different colors instead. Any ideas as to why this might occur?

You didn't set BITS_PER_PIXEL=8 in the PostScript device. :-)
Thus, you are only seeing 16 possible colors. I'd use PSCONFIG
to configure your PS device. Then this problem will be relegated
to the past forever.

Cheers,

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

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[Message index]

		IDL Colorbar generation question By: britneys on Mon, 03 July 2006 15:19
		Re: IDL Colorbar generation question By: David Fanning on Thu, 06 July 2006 09:16
		Re: IDL Colorbar generation question By: britneys on Wed, 12 July 2006 15:41
		Re: IDL Colorbar generation question By: britneys on Wed, 05 July 2006 15:07
		Re: IDL Colorbar generation question By: David Fanning on Tue, 04 July 2006 02:15
		Re: IDL Colorbar generation question By: David Fanning on Thu, 13 July 2006 01:07

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