| Re: reverse color table [message #72437] |
Sun, 12 September 2010 04:12 |
tegus
Messages: 20
Registered: October 2008
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Junior Member |
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On Sep 11, 10:21 am, David Fanning <n...@dfanning.com> wrote:
> tegus writes:
>> I think this will accomplish the same thing without reversing the
>> color table -- just use so me of the PLOT keywords instead:
>
>> LoadCT, 0
>> Plot, Y, BACKGROUND=255, COL=0
>
>> You can also use other color tables if you want to use colors other
>> than black and white.
>
> The suggestion to use keywords is correct. But the
> suggestion to use these particular indices will
> prove disastrous if you want to create a
> PostScript file with this command. Instead,
> you should load drawing colors anywhere
> *except* indices 0 and 255.
>
> A program like FSC_COLOR will take care of
> this detail (and many others) for you:
>
> Plot, data, BACKGROUND=FSC_Color('white'), $
> COLOR=FSC_Color('black')
>
> FSC_COLOR is a Coyote Library routine.
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
David,
Thanks for the tip regarding PostScript!!
Bill
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| Re: reverse color table [message #72439 is a reply to message #72437] |
Sat, 11 September 2010 07:21  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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tegus writes:
> I think this will accomplish the same thing without reversing the
> color table -- just use so me of the PLOT keywords instead:
>
> LoadCT, 0
> Plot, Y, BACKGROUND=255, COL=0
>
> You can also use other color tables if you want to use colors other
> than black and white.
The suggestion to use keywords is correct. But the
suggestion to use these particular indices will
prove disastrous if you want to create a
PostScript file with this command. Instead,
you should load drawing colors anywhere
*except* indices 0 and 255.
A program like FSC_COLOR will take care of
this detail (and many others) for you:
Plot, data, BACKGROUND=FSC_Color('white'), $
COLOR=FSC_Color('black')
FSC_COLOR is a Coyote Library routine.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: reverse color table [message #72441 is a reply to message #72439] |
Sat, 11 September 2010 05:39 |
tegus
Messages: 20
Registered: October 2008
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Junior Member |
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On Sep 10, 4:43 am, bing999 <thibaultga...@gmail.com> wrote:
> Hello,
>
> i want to make a plot which is a D histogram in which the color table
> is black and white (loadct,0).
>
> I need to reverse the color table (reverse_ct.pro) for my plot. But
> when I do that the axis, ticks, labels... disappear because in the new
> reversed color table they are in white.
> Is it possible to force the axis, labels... to be in black and use the
> reversed color table for the histogram only?
>
> thank you in advance!
Hi!
I think this will accomplish the same thing without reversing the
color table -- just use so me of the PLOT keywords instead:
LoadCT, 0
Plot, Y, BACKGROUND=255, COL=0
You can also use other color tables if you want to use colors other
than black and white.
Bill
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