Re: FW: [GMT-HELP] Fwd: How to make a non-symmetric color pallet around zero

Hello Basem,

Once you have your cpt-file according to the suggestions of the other
colleagues, such as

-75 whatever...
-50 whatever...
-25 whatever...
0 whatever...
50 whatever...
100 whatever...
150 whatever...


you should be able to *PLOT* your scale with psscale using the -L option.

This option  (cpt-file) of psscale *"Gives equal-sized color rectangles.
 Default  scales  rectangles according  to  the  z-range  in the cpt-file
 (Also see -Z)."* according to the man page.

Best wishes

Juan Diaz-Naveas

On Wed, Jan 15, 2014 at 5:34 AM, Gery . <[email protected]> wrote:

>
> Hallo Basem,
>
> how about if you just make two calls and then paste it together, then you
> use the final cpt. Something like this (untested):
>
> makecpt -Z -Chaxby -T-75/0/25 -N > cpt1
> makecpt -Z -Crainbow -T0/150/50 -N > cpt2
> cat cpt1 cpt2 > cpt
>
> would that help?
>
> Prost,
>
> Gery
>
>
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>
> > Date: Wed, 15 Jan 2014 09:21:29 +0300
> > From: [email protected]
> > Subject: [GMT-HELP] FW: [GMT-HELP] Fwd: How to make a non-symmetric
> color pallet around zero
> > To: [email protected]
>
> >
> > Sorry I forgot the attachment
> >
> > -----Original Message-----
> > From: basem elsaka [mailto:[email protected]]
> > Sent: 15 January, 2014 9:21 AM
> > To: Help Mailing List ([email protected])
> > Subject: RE: [GMT-HELP] Fwd: How to make a non-symmetric color pallet
> around
> > zero
> >
> > Hallo Walter, here is the same output
> > Nothing changed by multiplying the +ve values by 2.
> > The main problem as I think and addressed before is in psscale -B
> option. Is
> > there any solution to divide from -75 to 0 every 25 and divide 0 to 150
> > every 50 at the same time??? Then one can easily get symmetric scale
> around
> > zero, despite of different numbers.
> > I think it is a hard jop using GMT. Or not?
> > Basem
> >
> > -----Original Message-----
> > From: Walter (HF) Smith [mailto:[email protected]]
> > Sent: 14 January, 2014 3:04 PM
> > To: [email protected]
> > Cc: [email protected]
> > Subject: Re: [GMT-HELP] Fwd: How to make a non-symmetric color pallet
> around
> > zero
> >
> > Why can't you use makecpt to generate from -75 to +75 with steps of 25,
> and
> > then use awk to multiply the positive values by two?
> >
> >
> > On Jan 14, 2014, at 6:17 AM, basem elsaka wrote:
> >
> > > Hallo Shahar,
> > > I have the same problem like you. I'm trying to make symmetric
> > > colorbar from non-symmetric color scale As you can see in the attached
> > > map, I'm trying to plot from -75 to zero every 25 spacing and from 0
> > > to 150 every 50. My target is from -75 to 150 only 6 spacing (3
> > > negative and 3 positive).
> > > There are mainly three problems:
> > > 1- as mentioned (symmetric spacing issue)
> > > 2- how to play with -B option in psscale to be -B25 and -B50 at the
> > > same time ?? is there an option in psscale that is similar to -T in
> > makecpt?
> > > 3- how to make continuous colorbar in makecpt after appending the file
> > > with -N option? Because as you see nobody can distinguish between
> > > negative and positive values.
> > > Of course writing the following will lead to another color series (see
> > > 2nd
> > > attachment)
> > >
> > > makecpt -Z -Chaxby -T-75.0/0.0/25.0 -N > paletteTwice.cpt makecpt -Z
> > > -Crainbow -T0.0/150.0/50.0 >> paletteTwice.cpt
> > >
> > > So did you or anyone succeed to solve this problem. Anyone has
> > > suggestions, pleeeeez
> > >
> > > Basem
> > > Institute of Geodesy and Geoinformation, Bonn, Germany
> > > Currently: KACST, Saudi Arabia
> > >
> > >
> > > -----Original Message-----
> > > From: World-Wide GMT Usage and Help Mailing List
> > > [mailto:[email protected]] On Behalf Of Paul Wessel
> > > Sent: 08 January, 2014 2:14 AM
> > > To: [email protected]
> > > Subject: [Bulk] Re: [GMT-HELP] Fwd: How to make a non-symmetric color
> > > pallet around zero
> > >
> > > In GMT5 see makecpt's new option -G for selecting just part of an
> > > incoming cpt range. You can then run makecpt twice; first for the
> > > negative values and you stretch those via your -Tmin/0/inc and then
> > > append the positive side stretched with -T0/max/inc, using -N during
> the
> > first call.
> > > in GMT4 you'll need to do some awking.
> > >
> > > -p
> > >
> > > On Jan 7, 2014, at 12:53 PM, Shahar Barak <[email protected]>
> wrote:
> > >
> > >> Hi,
> > >>
> > >> I'm trying to plot a figure that shows velocity perturbations by
> > >> color (results of seismic tomography). I want values at zero and
> > >> around zero to be white, but I don't want the color pallet to be
> > >> symmetric. The minimum and maximum values are different.
> > >> In order to force white to be around zero I use grd2cpt with the -T
> > >> option, however this forces the color pallet to be symmetric.
> > >> Any ideas on how to accomplish this? I need it to be automated, i.e,
> > >> not by manually editing the CPT file.
> > >>
> > >> Thanks,
> > >>
> > >> Shahar
> > >>
> > >> To unsubscribe, send the message "signoff gmt-help" to
> > >> [email protected]
> > >
> > > To unsubscribe, send the message "signoff gmt-help" to
> > > [email protected]
> > >
> > > To unsubscribe, send the message "signoff gmt-help" to
> > > [email protected] <symmetric_scale.jpg><symmetric_scale_2.jpg>
> >
> > To unsubscribe, send the message "signoff gmt-help" to
> [email protected]
>  To unsubscribe, send the message "signoff gmt-help" to
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>

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