Re: pm3d palette question

[Philipp K. J. <ja...@ie...>]

On Friday 07 March 2008 16:47, you wrote:
> On Monday 03 March 2008 17:42, Philipp K. Janert wrote:
> > Here is my question (in short):
> > Is it possible to adjust the slice of the spectrum
> > shown in the colorbox without affecting the mapping
> > of colors to z-values?
>
> I can't think of a good way to do this currently.
> A very ugly way is to use
>   "set colorbox user origin X,Y size XX,YY"
> to create a huge colorbox that goes off-scale, then
> cover over the unwanted extremities with white-filled
> rectangles.

You are right, that is ugly... ;-)

>
> This is yet another case in which it would be very nice to
> be able to specify a mapping function linking the scales of
> two different plot axes.  Usually people want this for x / x2,
> but in your case I guess it would be z / cb.

That's an interesting idea, to have a 
separate mapping function.

In my current case, I was able to get acceptable
results using something like:

set logscale cb
set palette defined ( log(1) 'red', log(2) 'blue', ... )

to spread out the part of the palette that I was
mostly interested in.

Thanks for your comments!

Best,

		Ph.



>
> 	Ethan
>
> > Here is what I try to do:
> >
> > Say, I want to plot some data, the values of which
> > are in the range [0:100], and I want to show ALL
> > the values, therefore: set zrange [0:100]
> >
> > Now I have a very skewed palette, like so:
> > set palette defined ( 0 'red', 1 'white', 100 'blue' )
> >
> > For convenience, the index in the colorbox maps
> > directly to the z-value.
> >
> > Now I want to show in the colorbox only those colors
> > that map to z-values between 0 and 10, without
> > affecting the mapping!
> >
> > Is there a way to do this?
> >
> > Using set cbrange [0:10] will not do it, because this
> > affects the mapping. It will associate "blue" with the
> > z-value 10 and adjust all the intermediate values
> > accordingly. That's not what I am trying to do.
> >
> > Any suggestions?
> >
> > Best,
> >
> > 		Ph.
> >
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