| Re: BGR color instead of RGB [message #41798] |
Tue, 07 December 2004 06:12  |
war
Messages: 21
Registered: December 2003
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Junior Member |
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Hi again,
Dave, you are just great. Thanks for the quick reply.
The reason I thought it was backward is that when looking at, say, html
color, the red one is defined by the code #FF0000, so I just assumed it
is the same.
Andry
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| Re: BGR color instead of RGB [message #41849 is a reply to message #41798] |
Tue, 07 December 2004 06:12  |
war
Messages: 21
Registered: December 2003
|
Junior Member |
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|
Hi again,
Dave, you are just great. Thanks for the quick reply.
The reason I thought it was backward is that when looking at, say, html
color, the red one is defined by the code #FF0000, so I just assumed it
is the same.
Andry
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| Re: BGR color instead of RGB [message #41850 is a reply to message #41798] |
Tue, 07 December 2004 05:51 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Andry William writes:
> I have been looking on the group about a problem I am having with the
> color.
> This seems to be something a lot of people have already experienced
> but I am not sure I found the solution on how to solve it.
>
> Our group is thinking of buying IDL 6.1 so I am trying to test it on
> our system.
>
> I do a plot using
>
> PLOT, randomu(n,20), color='ff0000'x, background='ffffff'x
>
> it just comes out with a blue color (instead of red). It seems like it
> uses BGR
> table rather than RGB.
>
> I appreciate any input on understanding how I can get the right color
> (I mean, the usual RGB color). What startup or configuration should I
> use.
I think this is the right color. Perhaps it's *you* who is
thinking backwards. In a 24-bit number, the lowest 8 bits
specify red, the middle 8 bits specify green, and the
highest 8 bits specify blue.
IDL> Print, Binary('ff0000'xL)
1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Where the low bits are on the right, as in most numbers.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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