[Paraview] question about color mapping

[David E DeMarle]

It doesn't affect the scalars themselves, just the colors that are
assigned to them.

Say you use a red to green to blue color map, with red corresponding
to -10 and green corresonding to 0 and blue corresponding to 10.

Say you apply some filter or step to another timestep and your new
data values change from having a range of -10 to 10 to a new range of
9 to 10. All the data now looks blue.

If you click rescale to color range, the data that has a value of 9
will now look red instead and you will see all the colors along the
map.

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Thu, Jun 28, 2012 at 2:25 PM, Tom Schoenemann <toms at indiana.edu> wrote:
> In the "Edit Color Map" section of the display, one of the options is to
> "Rescale Range". Hovering over it with the mouse it says: "Click this button
> to rescale the color map to a new range"
>
> Does this mean that, e.g., if my scalar values go from 2 to 10, and I use
> this "Rescale Range" option to have a minimum of 3 and a maximum of 9, does
> Paraview literally rescale the values, so that 2 now becomes 3, 10 now
> becomes 9, and all the intermediate values are similarly shifted?  Or does
> this mean that every value between 2 and 3 now gets colored the same as 3,
> and everything between 9 and 10 gets colored the same as 9?
>
> In other words, are the scalar values being compressed, or just truncated,
> with respect to the colors?
>
> Thanks for any clarification,
>
> -Tom
>
> _________________________________________________
> P. Thomas Schoenemann
>
> Associate Professor
> Department of Anthropology
> Indiana University
> Bloomington, IN  47405
> Phone: 812-855-8800
> E-mail: toms at indiana.edu
>
> Open Research Scan Archive (ORSA) Co-Director
> Consulting Scholar
> Museum of Archaeology and Anthropology
> University of Pennsylvania
>
> Homepage: http://mypage.iu.edu/~toms/
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