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Adding extra white in middle of colour bar [message #85604]

Wed, 21 August 2013 03:20

Sir Loin Steak
Messages: 42
Registered: January 2012

Member

Hi all,

I am plotting data that range from negative to positive, so am using a blue-white-red colour bar. However, I would like there to be more white in the middle of the bar.

At the moment I'm using the following clumsy commands to achieve this:

maxv = 10
cgloadct, 13, /brewer, /reverse, ncolors=9, bottom=0, /silent, clip=[0,225]
cgloadct, 16, /brewer, ncolors=9, bottom=12, /silent, clip=[0,225]
clev = scale_vector(findgen(21), -maxv, maxv)
ccol = bindgen(21)
;Make middle levels white
ccol[9:11] = cgcolor('white')

and then:

cgColorbar, ncolors=20, range=[-maxv, maxv]

While this gives me the plot shading I want, the colour bar is incorrect. As I have manually altered the middle values to white, they don't show in the colour bar, which only uses the 18 colours defined by cgloadct.

Is there a simple way around this?

Thanks.

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[Message index]

		Adding extra white in middle of colour bar By: Sir Loin Steak on Wed, 21 August 2013 03:20
		Re: Adding extra white in middle of colour bar By: David Fanning on Wed, 21 August 2013 06:03
		Re: Adding extra white in middle of colour bar By: Sir Loin Steak on Wed, 21 August 2013 06:33
		Re: Adding extra white in middle of colour bar By: David Fanning on Wed, 21 August 2013 07:04
		Re: Adding extra white in middle of colour bar By: Sir Loin Steak on Wed, 21 August 2013 12:52
		Re: Adding extra white in middle of colour bar By: David Fanning on Wed, 21 August 2013 17:13
		Re: Adding extra white in middle of colour bar By: Sir Loin Steak on Thu, 22 August 2013 05:57
		Re: Adding extra white in middle of colour bar By: David Fanning on Thu, 22 August 2013 06:15

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