Quote Originally Posted by Uwe View Post
QwtRasterData::value(...) returns a value for all x/y positions inside the bounding rectangle. This is how it is defined - otherwise your implementation is insufficient.

A QwtRasterData object that sits on a 2 dimensional array always has to do an internal resampling ( in most cases simply next neighbour ) because the pixel positions never meet the raster.

Uwe
Hmmm, I lost my reply made yesterday...

From your internal resampling data, can I get back your resampled value at location (x, y)? If so, how?

Thanks