> There is a bug with interpolate 3, now that you mention it. When you 
> wrap the interpolated image inside a pigment_pattern, the white portions 
> of the image turn black....
> 

That could be because the values are not clipped to [0,1] after the 
interpolation. IIRC in a pigment_pattern, only the fractional part is 
taken into account, i.e. if the pigment value is 1.1, higher than white, 
it is mapped to 0.1, nearly black.
Even if all grid points have values between 0 and 1, with the bicubic 
interpolation you can get values out of that range. This does not happen 
with bilinear interpolation.

In my code I have a choice to clip or not the value, in Megapov I don't 
know what choice has been made...

Regards

-- 
Vincent

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