[Paraview] question about color mapping

[Tom Schoenemann]

Good, OK. So if I use "Rescale Range" and set every file to, say, -10 to 10 (regardless of the underlying scalar values they might have), then color differences between these various files would truly indicate differences between them for the underlying scalar values?

-Tom

On Jun 28, 2012, at 3:49 PM, David E DeMarle wrote:

> 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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_________________________________________________
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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