[Insight-users] How to invert a float image?

[lynx.abraxas at freenet.de]

Hello!


Changing         from         SingedDanielssonDistanceMapImageFilter        to
DanielssonDistanceMapImageFilter I need to invert the output  of  the  filter.
I'd  like  to  use  float  as  output for the distance map to be able to store
sqrt(2). I don't mind big vales to be unexact. So I think float  is  the  best
choise.  Using  squared output I'd need int to store the data which would need
more memory.
My problem: InvertIntensityImageFilter only gives a black image if  I  let  it
invert float.
Can a float image be inverted at all?
Is int the only way to go?

Many thanks for any help or hints
Lynx