Re: Fusing before or after

> 2009/5/25 Markku Kolkka <markku.kol...@...>
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> > DaveN kirjoitti viestissään (lähetysaika lauantai, 23. toukokuuta
> > 2009):
> > > I don't know if this has been asked before (hard question to
> > > ask in a search) but why don't people fuse their images before
> > > making panoramas?
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> > I'm getting highlight banding artifacts when fusing (to 16-bit
> > TIFF) before making the panorama. See e.g. the top left corner
> > ofhttp://static.panoramio.com/photos/original/10143416.jpg
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> > --
> >  Markku Kolkka
> >  markku.kol...@...
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> You mention that you fuse to 16bit tiff.  Fusing from what source images,
> also 16bit tiff or from 8bit tiff or jpg?
> If you are fusing from jpg or 8bit tiff you might run into the "banding
> artifact" issue which is described on enblend.sourceforge.net athttp://enblend.sourceforge.net/banding.htm.
> Actually only the conclusion matters:
> *"In summary, it is a combination of numerical precision errors and
> limitations of an 8 bit/channel color format that is the cause of the
> banding artifacts. Rounding errors were responsible for the shape of the
> bands, but this was just hiding the underlying issue that 256 levels of
> green is not enough for quality digital imaging."*
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> Harry