MantisBT - ParaView
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IDProjectCategoryView StatusDate SubmittedLast Update
0007308ParaView(No Category)public2008-07-08 15:162010-12-13 16:18
Reporterufnoise 
Assigned ToDave DeMarle 
PrioritynormalSeverityfeatureReproducibilityalways
StatusclosedResolutionwon't fix 
PlatformOSOS Version
Product Version 
Target VersionSomedayFixed in Version 
Project
Topic Name
Type
Summary0007308: Please add new filter for colormap
DescriptionPlease allow an addition checkbox when editing the color map.

Two candidates:
log(abs(x) + smallvalue)
asinh(x)

This colormap filter would allow visualization of signed exponentially varying quantities.
Steps To Reproduce
Additional InformationIn semiconductor devices, the net doping is a signed quantity which
can very exponentially. It is typical in most device simulation
packages as it refers to the signed number of donors (positive) and
acceptors (negative).

Other candidates for a colormap options would be a "Use log of the
absolute value", or even "Use asinh scale".
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Issue History
Date ModifiedUsernameFieldChange
2008-07-08 15:16ufnoiseNew Issue
2008-07-08 17:01Ken MorelandNote Added: 0012662
2009-05-13 13:49Utkarsh AyachitTarget Version => Someday
2010-12-10 14:09Dave DeMarleNote Added: 0023883
2010-12-10 14:09Dave DeMarleStatusbacklog => @80@
2010-12-10 14:09Dave DeMarleResolutionopen => won't fix
2010-12-10 14:09Dave DeMarleAssigned To => Dave DeMarle
2010-12-13 16:18Alan ScottNote Added: 0023939
2010-12-13 16:18Alan ScottStatus@80@ => closed
2011-06-16 13:10Zack GalbreathCategory => (No Category)

Notes
(0012662)
Ken Moreland   
2008-07-08 17:01   
I don't think the log(abs(x) + smallvalue) will work. In my experience what often happens is that if you just pick some very small value for the minimum, the majority of the scale gets placed below the range where values are. For example, if you pick 1e-300 for the smallvalue and you apply that to a data range from 0 to 1e10, any values above 1 will be in the top 3% of the scalar bar. When using a table map of 256 values (the default), all of these values will be the same (top) color.

Raising the value of smallvalue is equally problematic. If you raise it too high, you will miss information at the lower end of the range.
(0023883)
Dave DeMarle   
2010-12-10 14:09   
If you still want to see this feature in ParaView please submit an idea to user voice.
(0023939)
Alan Scott   
2010-12-13 16:18   
Agreed. Please post this request to User Voice.