| Re: getting procedures to use proper color index via LOADCT, x [message #10644] |
Wed, 24 December 1997 00:00 |
grunes
Messages: 68
Registered: September 1993
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Member |
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In article <349E1DA1.DDBA7E22@linmpi.mpg.de> Kevin Ivory <Kevin.Ivory@linmpi.mpg.de> writes:
> From: Kevin Ivory <Kevin.Ivory@linmpi.mpg.de>
> Subject: Re: getting procedures to use proper color index via LOADCT, x
> Date: Mon, 22 Dec 1997 08:58:25 +0100
> dmarshall@ivory.trentu.ca wrote:
>> But then my plots only ever show up in various shades of red.
> device, decomposed=0
> From the IDL online help:
> Set this keyword to 0 to cause the least-significant 8 bits of the color index value to be interpreted as a PseudoColor index. This setting allows users with DirectColor and TrueColor displays to use IDL programs written for standard, PseudoColor display
> without modification.
> Set this keyword to 1 to cause color indices to be interpreted as 3, 8-bit color indices where the least-significant 8 bits contain the red value, the next 8 bits contain the green value, and the most-significant 8 bits contain the blue value. This is th
> way IDL has always interpreted pixels when using visual classes with decomposed color.
That would be nice. It doesn't work on SGI workstations, so I would guess it
might not work on other X-windows systems--haven't had a chance to try. Of
course, I am using an old version of IDL, and have never played with
the .xdefaults file. But Fanning claims it works on PCs.
------------------------------------------------------------ -
Mitchell R Grunes, grunes@imsy1.nrl.navy.mil. Opinions are mine alone.
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| Re: getting procedures to use proper color index via LOADCT, x [message #10655 is a reply to message #10644] |
Mon, 22 December 1997 00:00  |
Kevin Ivory
Messages: 71
Registered: January 1997
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Member |
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dmarshall@ivory.trentu.ca wrote:
> But then my plots only ever show up in various shades of red.
device, decomposed=0
From the IDL online help:
Set this keyword to 0 to cause the least-significant 8 bits of the color index value to be interpreted as a PseudoColor index. This setting allows users with DirectColor and TrueColor displays to use IDL programs written for standard, PseudoColor displays
without modification.
Set this keyword to 1 to cause color indices to be interpreted as 3, 8-bit color indices where the least-significant 8 bits contain the red value, the next 8 bits contain the green value, and the most-significant 8 bits contain the blue value. This is the
way IDL has always interpreted pixels when using visual classes with decomposed color.
Best regards
Kevin
--
Kevin Ivory Tel: +49 5556 979 434
Max-Planck-Institut fuer Aeronomie Fax: +49 5556 979 240
Max-Planck-Str. 2 mailto:Kevin.Ivory@linmpi.mpg.de
D-37191 Katlenburg-Lindau, GERMANY http://www.gwdg.de/~kivory2/
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| Re: getting procedures to use proper color index via LOADCT, x [message #10656 is a reply to message #10655] |
Mon, 22 December 1997 00:00 |
rivers
Messages: 228
Registered: March 1991
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Senior Member |
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In article <ELK5uC.1G0.A.ebony@news.trentu.ca>, dmarshall@ivory.trentu.ca writes:
> A lurker de-lurks:
>
> I am running Student Version IDL 5.0 on Windows 95
>
> I cannot get procedures like SURFACE etc to access the loaded color table.
>
> LOADCT, 5
>
> Gives me no problem, no error messages and it confirms loading the table.
>
> But then my plots only ever show up in various shades of red.
> I confirm this by running CINDEX.
It sounds like your display is set to True Color. Do HELP, /DEVICE to check.
If it is then doing SURFACE, COLOR='50'x will produce a red plot. However
doing SURFACE, COLOR='505050'x will draw using the correct color in your
lookup table. True color in IDL is pretty tricky, and not very will documented
IMHO. David Fanning's Web page has some very useful tips.
You can also simply change your display to 256 colors, but then you have the
limitations of a limited color map.
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