comp.lang.idl-pvwave archive: archive » 16-bit colors in Linux (Re: 24 bit colors in IDL)

Home » Public Forums » archive » 16-bit colors in Linux (Re: 24 bit colors in IDL)

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

16-bit colors in Linux (Re: 24 bit colors in IDL) [message #13547]

Thu, 19 November 1998 00:00

G. Hugh SONG
Messages: 3
Registered: November 1998

Junior Member

David Fanning wrote:

> 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.

Wow!

I really don't understand why this must be this much
complicated.
Originally whose fault is this for this complication
on different machines?

On my Linux, it appears that different XFree86 servers
have different color devices or whatever.
Admittedly, I don't know what is going on.

I simply want the color resources should not be
exhausted and be correctly displayed if I use more than
8-bit colors. Yet, IDL does not fire up without doing something
special at 16-bit colors.

Is this because there are variations such as
TrueColor and DirectColor on different Unix/X11
machines?

There must be a FAQ on this topic.
Can someone direct me to FAQ?

THanks

--
G. Hugh Song

PS: Please remove "Spamspoiler" when replying

Report message to a moderator

[Message index]

		16-bit colors in Linux (Re: 24 bit colors in IDL) By: G. Hugh SONG on Thu, 19 November 1998 00:00
		Re: 16-bit colors in Linux (Re: 24 bit colors in IDL) By: davidf on Wed, 18 November 1998 00:00
		Re: 16-bit colors in Linux By: mallors on Fri, 20 November 1998 00:00
		Re: 16-bit color By: Nigel Wade on Wed, 14 November 2001 02:57
		Re: 16-bit color By: James Kuyper on Wed, 14 November 2001 09:09
		Re: 16-bit color By: Nigel Wade on Thu, 15 November 2001 06:10
		Re: 16-bit color By: James Kuyper on Tue, 13 November 2001 12:55
		Re: 16-bit color By: Paul van Delst on Tue, 13 November 2001 10:22
		Re: 16-bit color By: Rick Towler on Tue, 13 November 2001 09:30
		Re: 16-bit color By: Pavel A. Romashkin on Tue, 13 November 2001 08:51
		Re: 16-bit color By: James Kuyper on Tue, 13 November 2001 07:49
		Re: 16-bit color By: David Fanning on Mon, 12 November 2001 14:03
		Re: 16-bit color By: Logan Lindquist on Thu, 15 November 2001 05:18
		Re: 16-bit color By: Paul van Delst on Thu, 15 November 2001 06:57
		Re: 16-bit color By: Nigel Wade on Thu, 15 November 2001 06:33
		Re: 16-bit color By: James Kuyper on Mon, 12 November 2001 13:33
		Re: 16-bit color By: Rick Towler on Mon, 12 November 2001 11:36

Previous Topic:	Re: CALL_EXTERNAL simple problem ?
Next Topic:	16-bit color

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 15:53:50 PDT 2025

Total time taken to generate the page: 0.00427 seconds