The premultiplication problem will not be an issue for my little
interpolator since I do not composite. But it would be for someone
trying to use my interpolator for another purpose than what it was
designed for.
You said that you don't need have the premultiplication problem because
you do not composite, but I wanted to be clear about the terminology
here in case someone else comes across this thread.
The premultiplied form should be used if you have alpha in the images,
whether or not you composite. After reading your description it sounds
like your images don't have or need alpha since you are simply doing
panoramic stretching of opaque photographs, right? So, it's really the
lack of an alpha channel which means that the premultiplied issue isn't
applicable here, not the lack of "compositing"...
...jim
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