Am 17.03.2011 03:49, schrieb Trevor G Quayle:

> The interpolate 2 seems to cause banding at the transition points.

Cubic interpolation produces "overshoot" and "undershoot" at sharp 
transitions. I usually store values from 0.25 to 0.75 in df3 files to 
avoid such problems.

> One thing I noticed is that with interpolate 1 there is a distinct shift down
> and to the left.  Is there a bias in the internal interpolate function?  This is
> something that I have noticed before with interpolate.

It was known (and fixed) for interpolation of input images, but has 
never been examined for df3 files yet.

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