Alain <ele### [at] netscapenet> wrote:
> minzi0815 nous illumina en ce 2008-05-27 09:18 -->
> > Hi,
> >
> > I have a df3-file that holds 2-byte values and have problms setting up the
> > color_map - not very successfull yet.
> >
> > I have tried outthings like :
> >
> > color_map{
> >         [0 rgb 0]
> >     [1 rgb <1,1,1>]
> >  }
> >
> > ....or...
> >
> > color_map{
> >  [0.2 rgb <0,0,0>]
> >  [0.3 rgb <1,0,0>]
> >  [0.4 rgb <0,1,0>]
> >  [0.5 rgb <0,0,1>]
> >  [0.8 rgb <1,1,1>]
> >  }
> >
> > ....but not very successfull yet. What I want to achieve us to have a different
> > color for every different value in the df3-file.
> >
> > Any idea ? Thanks in advance...
> >
> >
> >
> >
> A color_map can have at most 256 entries. It's interpolated between the given
> values, I think that it's a linear interpolation.
>
> The first map give a linear ramp going from black (no media) to white. The
> result should be the same as if you don't provide any map.
>
> The second map turn off any voxel with a value of 0.2 or less, then raise to
> pure red at 0.3, shift to green at 0.4 with yellow at 0.35, then turn blue at
> 0.5, then turn to pure white at 0.8 and stay there for any value larger than
> 0.8. That white can hide the contribution of other voxels on the same ray.
>
> --
> Alain
> -------------------------------------------------
> Cat, n.: Lapwarmer with built-in buzzer.

So than means, the 65535 possible values are scaled to 256 colors ?
Means black for 0-255 ...

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