[vtkusers] Why does VTK use doubles for color?

[David Doria]

Is there a reason that unsigned chars are not used for all things related to
color? For example

vtkProperty::SetColor(double,double,double) //expects values from 0.0 to 1.0
http://www.vtk.org/doc/nightly/html/classvtkProperty.html#aa591fc54d4e2d21e2c7a97ef7cd2a993

vtkViewPort::SetBackground(double,double,double) //expects values from 0.0
to 1.0
<http://www.vtk.org/doc/nightly/html/classvtkProperty.html#aa591fc54d4e2d21e2c7a97ef7cd2a993>
http://www.vtk.org/doc/nightly/html/classvtkViewport.html#a85eaf3ee2b0e49423efbaa41de17112d

Wouldn't it be more natural to define these as

vtkProperty::SetColor(unsigned char,unsigned char,unsigned char) //expects
values from 0 to 255
vtkViewPort::SetBackground(unsigned char,unsigned char,unsigned
char) //expects values from 0 to 255

?

Thanks,

David
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