Comments on: Matlab colorbar with Gnuplot

By: yakoudbz

yakoudbz — Sat, 24 May 2014 09:16:00 +0000

I think this is a much better way to define the palette:

f(x)=1.5-4*abs(x)
set palette model RGB
set palette functions f(gray-0.75),f(gray-0.5),f(gray-0.25)

By: hagen

hagen — Wed, 26 Mar 2014 08:16:35 +0000

In reply to Cindy. Hi Cindy. Can you tell what command or file you run? The code for Fig. 1 runs fine for me.

By: Cindy

Cindy — Wed, 26 Mar 2014 01:58:38 +0000

Hi,
I got an error message saying
error: invalid conversion from string to real N-d array
error: set: expecting graphics handle as first argument

would you please tell me what could happen here?

By: hagen

hagen — Fri, 13 Sep 2013 08:49:30 +0000

You can use GIMP for this, there is a tool called color picker which does the job. This works for one color at once.

By: xuli

xuli — Fri, 13 Sep 2013 02:52:19 +0000

Hye,
Hello,
Can someone help me how to extract colour from an image and display the extracted colour as colour palette?

By: Arno Nym

Arno Nym — Mon, 26 Aug 2013 10:33:29 +0000

Thanks hagen, the »set cbrange« command was exactly what I was looking for.

By: José Zapata

José Zapata — Mon, 13 May 2013 01:13:36 +0000

Thank you!

By: hagen

hagen — Fri, 12 Apr 2013 08:53:51 +0000

Hi johannes. For me it just works.

Fig. 2 Photoluminescence yield plotted with a blue-red-colormap (code to produce this figure, data)

The colors are automatically scaled to your data values or to the values you specify with

set cbrange [$MIN:$MAX]

By: johannes

johannes — Thu, 11 Apr 2013 23:27:41 +0000

hi,
i am trying to use another color map which i found here:
http://bastian.rieck.ru/blog/posts/2012/gnuplot_better_colour_palettes/.
this map goes from blue over grey to red (cool to warm map). but somehow gnuplot adds some new colors like green and yellow. does gnuplot somehow interpolate missing colors?
my data range is currently 0 to 4, do i have to care about that or will gnuplot automatically adapt the range of the colormap so that it fits the data range?
thanks for answers or helping ideas.
-johannes

By: maximilien

maximilien — Wed, 04 Jul 2012 14:34:49 +0000

Thanks for this great post :)