| Re: problem with color table, everything is red [message #82050] |
Mon, 19 November 2012 02:24  |
Helder Marchetto
Messages: 520
Registered: November 2011
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Senior Member |
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On Monday, November 19, 2012 11:13:37 AM UTC+1, simona bellavista wrote:
> I am having a hard time understanding colors in IDL. I am working on
>
> x11 (linux).
>
> I would be glad if someone can give me some tips about colors and
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> color tables.
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>
>
> when I try to load rainbow color table and display it with
>
>
>
> loadct, 13
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> tv, dist(300)
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>
>
> I always get a color panel that is in grey scale, I have tried to load
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> several color tables, but the resulting color panel I get is always in
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> shade of greys.
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>
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> Moreover, if I try to plot different part of my graphics with
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> different colors, using something like this:
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>
>
> for i=0,n-1 do begin
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> indx = start[i] + indgen(start[i+1]-start[i])
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> color = floor(i *255 / float(nlines))
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> oplot,x[indx],y[indx],color=color
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> endfor
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>
>
> I get my plot in shades of reds. I tried cgplot and it is the same.
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>
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> then in a subsequent plot I try to revert to black and white, and I
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> use
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>
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> plot, xx, yy,color=255, psym=2, symsize=2,
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>
>
> but everything turn red.
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>
>
> where shall I start?
Hi,
this is generally a good place to start from: http://www.idlcoyote.com
But specifically you are looking for this:
http://www.idlcoyote.com/misc/tg_working_with_color.pdf
On page 34 there are some extra Linux tips.
Then you should learn about the
Device, Decompose=1
command.
You will soon enough find out that not everything in IDL is grayscale and red :-)
Cheers,
Helder
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