Re: [Plplot-general] RGB mapping for plsmap1

[Tune K. <ka...@sl...>]

Curtis,

Thank you for the prompt response.
Yes, it is now working.

Many thanks for your advice.

Tune Kamae

----- Original Message ----- 
From: "Curtis Cooper" <cu...@hi...>
To: "Tune Kamae" <ka...@sl...>
Cc: <plp...@li...>
Sent: Saturday, December 04, 2004 9:37 PM
Subject: Re: [Plplot-general] RGB mapping for plsmap1


> I think the PLplot colormap setting functions expect color ranges clamped
> between [0,1].
>
> Cheers,
> Curtis
>
>
>
>       * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>     *   Curtis S. Cooper, Graduate Research Assistant         *
>    *    Lunar and Planetary Laboratory, University of Arizona  *
>    *    http://www.lpl.arizona.edu/~curtis/        *
>    *    Kuiper Space Sciences, Rm. 318                         *
>     *   1629 E. University Blvd.,                             *
>      *  Tucson, AZ 85721        * * * * * * * * * * * * * * *
>       * Wk: (520) 621-1471     *
>        * * * * * * * * * * * *
>
> On Sat, 4 Dec 2004, Tune Kamae wrote:
>
> > Dear PLplot experts,
> >
> > I have been using PLplot through python/numarray to plot
> > astronomical intensity maps in false color for 2 years.
> > Ever since I wrote the first shaded contour plot, I have
> > been wishing to improve the contrasts and the dynamic
> > range of the Hue mapping.  I came up with an inproved
> > mapping using RGB (can also be in HSV) by making
> > the function non0linear.  This requires many reference
> > points (eg. 20 points).
> >
> > Following  the manual description on plshades and
> > the python example xw11.py, I wrote the following
> > cmap1_init_3D.  But it doesn't work.
> >
> > I would appreciate any guidance or suggestion.
> >
> > T. Kamae, Stanford Linear Accelerator Center.
> >
>
> --------------------------------------------------------------------------
--
> > #   Color map 1 in RGB space for plot3D
> > #   (from plplot/examples/python/xw11.py)
> >
> >     def cmap1_init_3D(self, gray):
> >         """Routine for defining a specific color map 1 in
> >         RGB space.  If gray is true, use basic grayscale
> >         variation from half-dark to light.  Otherwise use
> >         a parameteized mapping to R(z), G(z), and B(z) where
> >         z=[0,1].  i=0 corresponds to z=1.0, the brightest
> >         color for this implementation.
> >         """
> >
> >         # Independent variable of control points.
> >         i = arange(0.0, 1.05, 0.05)
> >         if gray:
> >             # Red for control points.
> >             r = arange(241.0, 0.0, -12.0)
> >             # Green for control points.
> >             g = arange(241.0, 0.0, -12.0)
> >             # Blue for control points.
> >             b = arange(241.0, 0.0, -12.0)
> >         else:
> >             z=arange(1.0,1.05,0.05)
> >             z[20]=1.0
> >             # Red for control points.
> >             r = 113.9*sin(7.64*z**1.705+0.701)-916.1*(z+1.755)**1.862\
> >                 +3587.9*z+2563.4
> >             rr = clip(r,0.0,255.0)
> >             # Green for control points.
> >             g = 70.0*sin(8.7*z**1.26-2.418)+151.7*z**0.5+70.0
> >             gg = clip(g,0.0,255.0)
> >             # Blue for control points.
> >             b = 194.5*z**2.88+99.72*exp(-77.24*(z-0.742)**2)\
> >                 +45.40*z**0.089+10.0
> >             bb = clip(b,0.0,255.0)
> >
> >         # Integer flag array is zero (no interpolation along far-side
> >         # of colour figure.)
> >         rev = array([0]+[1]*19+[0])
> >         # number of cmap1 colours is 256 in this case.
> >         # smaller the number of colours, the clearer the z contour
> >         #plscmap1n(256)
> >         plscmap1n(21)
> >         # Interpolate between control points to set up cmap1.
> >         plscmap1l(1, i, rr, gg, bb, rev)
> >
> >
> >
> >
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>