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Re: Fusing before or after

by Harry van der Wolf-3 :: Rate this Message:

2009/5/25 Markku Kolkka <markku.kolkka@...>

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?

I'm getting highlight banding artifacts when fusing (to 16-bit
TIFF) before making the panorama. See e.g. the top left corner
of http://static.panoramio.com/photos/original/10143416.jpg

--
Markku Kolkka
markku.kolkka@...

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 at http://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."

Harry

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