comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » 24 bit colors in IDL

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: 24 bit colors in IDL [message #13577 is a reply to message #13280]

Tue, 17 November 1998 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Andy Bristow (ajbristow@dera.gov.uk) writes:

> I was just getting my head round 24-bit, having been prompted by this
> thread. So, at Philip's suggestion I went to
>
> http://www.dfanning.com/tips/colors24.html
>
> All well and good. Sounds relatively straightforward.
>
> So on my SGI (IRIX 6.5.1, IDL 5.1) I tried some of the
> suggested code (immediatley after starting IDL up):
>
> device,decomposed=0
> tvlct,[[255],[255],[0]],100
> plot,randomu(10,10),color=100
>
> expecting the plot to be yellow, as advertised. Except no, _I_
> get a medium-light shade of grey!
>
> Any suggestions?

Oh, dear. I think this is one of those TrueColor/DirectColor
tricks that SGI engineers like to play on people. This is
a complication that I don't *even* want to know about.

Try this. Type this:

Device, Get_Visual_Name=thisName
Print, thisName

If thisName is "TrueColor" change it to "DirectColor":

Device, DirectColor=24

If thisName is "DirectColor" change it to "TrueColor":

Device, TrueColor=24

Do this *before* you open any graphics windows in IDL.
Try the code above again. Different? The same?

Please let us know. :-(

Cheers,

David

Note: A copy of this article was e-mailed to the original poster.

Report message to a moderator

[Message index]

		24 bit colors in IDL By: Richard Penrose on Tue, 03 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf7203 on Fri, 06 November 1998 00:00
		Re: 24 bit colors in IDL By: philip aldis on Fri, 06 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Thu, 12 November 1998 00:00
		Re: 24 bit colors in IDL By: Richard Penrose on Wed, 11 November 1998 00:00
		Re: 24 bit colors in IDL By: Andy Bristow on Tue, 17 November 1998 00:00
		Re: 24 bit colors in IDL By: Nigel Wade on Thu, 19 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Wed, 18 November 1998 00:00
		Re: 24 bit colors in IDL By: Nigel Wade on Wed, 18 November 1998 00:00
		Re: 24 bit colors in IDL By: Andy Bristow on Wed, 18 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Tue, 17 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Fri, 20 November 1998 00:00
		Re: 24 bit colors in IDL By: Vapuser on Fri, 20 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Thu, 19 November 1998 00:00
		Re: 24 bit colors in IDL By: Vapuser on Thu, 19 November 1998 00:00

Previous Topic:	Status Bar Help
Next Topic:	Is the new IDL5.2 for Linux ELF-based or a.out-based?

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 15:24:39 PDT 2025

Total time taken to generate the page: 0.64397 seconds